Duncan announced Monday that he will retire after 19 years in the NBA.

Duncan calls it quits after a 19-year NBA career where he averaged 19.0 points, 10.8 rebounds, 3.0 assists and 2.2 blocks per game while shooting 50 percent from the field. He made 15 All-NBA teams, 15 All-Defensive teams - the most all time - and was also a 15-time All-Star. The former No.1 overall pick out of Wake Forest also joined Kareem Abdul-Jabbar as the only two players in NBA history to record at least 26,000 points, 15,000 rebounds and 3,000 blocks in a career, cementing his legacy as one of the greatest power forwards to ever play the game. With Duncan no longer in the Spurs' rotation, it opens the door for LaMarcus Aldridge and Pau Gasol to dominate the frontcourt minutes even more this coming season.

Duncan is said to be "leaning strongly" toward announcing his retirement, Adrian Wojnarowski of Yahoo! Sports reports.

Duncan has reportedly told those close to him that he's planning on making an announcement regarding his future in the coming weeks, and it's believed he plans on stepping away from the game after a spectacular 19-year career. The Spurs seemingly prepared for a potential Duncan departure by signing Pau Gasol to a two-year, $30 million contract over the weekend, and it's uncertain if the 40-year-old would be willing to accept a backup role behind Gasol. Duncan already exercised his $5.6 player option for the 2016-17 season, so he'll be due that salary regardless of what he ends up deciding. He saw his production dwindle to career-worst levels last season, as he averaged just 8.6 points, 7.3 rebounds, 2.7 assists and 1.3 blocks across 25.2 minutes per game in his 61 appearances.

Duncan exercised his player option worth $5.6 million for next season Monday, but remains unsure whether he will return for 20th season, Adrian Wojnarowski of The Vertical reports.

According to Wojnarowski's report, Duncan is giving serious consideration to playing despite being 40 years old. Duncan's averages took a dip last season, as he posted just 8.6 points and 7.3 rebounds per game, and it's likely they'd dip even more next season along with his minutes. However, if healthy, Duncan still can serve as a great interior defender and capable offensive talent around the rim.

Duncan collected 19 points (7-14 FG, 5-6 FT), five rebounds and a block over 34 minutes in Thursday's 113-99 season-ending Game 6 loss to the Thunder.

After totaling just 17 points over the first five games of the series, Duncan was finally able to post his first double-digit scoring game of the postseason. It also marked the first time he took double-digit shot attempts in the playoffs, and the only instance he received over 30 minutes of playing time. Given his struggles at times this season, and his minimal playoff impact, the 40-year-old heads into the offseason with more questions than ever about his future.

Duncan had no points and grabbed three rebounds across 12 minutes during the Spurs' 111-97 loss to the Thunder in Sunday's Game 4.

Duncan didn't attempt a single shot and committed four fouls in his limited minutes, which resulted in him failing to score for the first time in 249 career playoff games. Given how extensively the Thunder opted to pair Steven Adams and Enes Kanter together in Game 4, it was somewhat surprising that Duncan was barely used. Coach Gregg Popovich has instead been calling David West's number during crunch time, and Duncan has been glued to the bench over the last two contests, seeing a combined 26 minutes.

Duncan finished with just two points (1-8 FG) nine rebounds and two assists in 28 minutes during Monday's Game 2 loss to the Thunder.

Although he did lead the team with nine rebounds, Duncan was never able to make his presence felt offensively. The five-time champion connected on just one of his eight shots and failed to get to the free throw line for the first time this postseason. It's good to see him being active on the glass, but San Antonio will need him to be more aggressive on the offensive end if they hope to make another deep playoff run.

Duncan had three points (0-1 FG, 3-4 FT), nine rebounds, four assists, one steal, and one block in 26 minutes during the Spurs' 94-68 win versus the Grizzlies on Tuesday.

Duncan has hauled in 20 rebounds through the first two playoff games while averaging five points, two dimes, 1.5 blocks, and one steal in 24 minutes per game. The Spurs have demolished what's left of the Grizzlies' injury-ravaged roster, and Duncan is unlikely to play heavy minutes in this series given the blowout nature of the contests. However, it's nice to see him grabbing boards and throwing textbook outlet passes to start up San Antonio's fast break, and the soon-to-be 40-year-old center is still anchoring the middle well for the best defensive club in basketball.

Duncan will be held out for Wednesday's game against the Mavericks for rest purposes, Paul Garcia of Project Spurs reports.

The Spurs have locked up the second seed in the Western Conference playoffs and are looking to keep Duncan spry heading into what could be another long postseason run. With Duncan out, along with fellow frontcourt players LaMarcus Aldridge and David West, look for Boris Diaw, Matt Bonner, and Boban Marjanovic to play extended minutes.

Duncan had 12 points (5-14 FG, 2-4 FT), nine rebounds, three assists, and one block across 34 minutes during the Spurs' 102-98 win versus the Thunder on Tuesday.

Duncan returned to the starting five Tuesday after receiving the night off for rest in Sunday's loss to the Warriors. The soon-to-be 40-year-old has played 34 minutes in both of his last two starts, which marks the first time he has seen that heavy of a load since he played a season-high 35 minutes back on Nov. 2 against the Knicks. The Spurs have been locked into the second seed in the Western Conference for quite a while, and Duncan is likely to be rested in Wednesday's regular season finale against the Mavericks.

Duncan (rest) will sit out Sunday's game against the Warriors, Paul Garcia of Project Spurs reports.

Duncan will sit Sunday after arguably his strongest game of the season on Friday against the Nuggets, in which he posted 21 points and seven rebounds. As the Spurs get ready for the postseason, it is not surprising to see head coach Greg Popovich rest his veteran players, even in a high-caliber game such as the one on Sunday, which could spell the end of the Warrior's regular season wins record. David West will get the start, with Boban Marjanovic also in line to pick up a few more minutes. Duncan's next chance to return will be against the Thunder on Tuesday.

Duncan registered 21 points (9-15 FG, 3-6 FT), seven rebounds, two assists and a block over 34 minutes in Friday's 102-98 loss to the Nuggets.

With the rest of the starting five resting, Duncan stepped up to deliver one of his strongest performances of the season. It was notably the perennial All-Star's first double-digit scoring effort after four straight single-digit outings, and the scoring total represented a season high. While the output was certainly impressive, it's worth noting that Duncan's offensive responsibility is not nearly as great when San Antonio deploys its usual starting lineup.

Duncan dropped eight points (3-10 FG, 2-2 FT), nine rebounds, three blocks, and one assist in 27 minutes during the Spurs' 100-92 win over the Pelicans on Wednesday.

Duncan sat out the last two games to rest, but re-joined the starting lineup on Wednesday versus the Pelicans. Spurs' coach Gregg Popovich will likely continue to rest Duncan down the stretch of the regular season fairly frequently, as he turns 40 on Apr. 25. As a result, make sure it's known that Duncan is indeed playing before counting on him in fantasy over the final seven contests.

Duncan is probable to play Wednesday against the Pelicans, Jeff McDonald of San Antonio Express-News reports.

After sitting out Saturday against the Thunder and Monday against the Grizzlies for rest, Duncan should have plenty of energy for a matchup with the undermanned Pelicans. If the Spurs are quickly able to turn Wednesday's game into a non-competitive affair, Duncan probably won't be asked to play more than 20-to-25 minutes.

Duncan will be available Friday against the Grizzlies but will then sit out Saturday versus Oklahoma City and Monday versus Memphis to rest.

The Spurs will rest a number of secondary players Friday night, and they'll then rest Duncan, Tony Parker and Manu Ginobili for each of the next two games. Duncan, in particular, could see more rest down the stretch as the Spurs gear up for the postseason.

Duncan stuffed the stat sheet with 16 points (7-11 FG, 2-5 FT), 10 rebounds, four blocks, two steals and two assists in 31 minutes of action during Monday's loss to the Hornets.

The ageless one bounced back from a one-point, two-rebound performance against the Warriors on Sunday, registering his first double-double in 10 appearances. Duncan still has the ability to produce outings such as this from time to time, but they have become few and far between. Despite this nice production, Duncan remains a shaky bet in fantasy from night to night.

Duncan will return to the starting lineup Monday night in Charlotte, Jeff McDonald of the San Antonio Express-News reports.

The Spurs made a late change and inserted Boris Diaw into the starting five Saturday against Golden State, and Duncan saw a season-low eight minutes in a reduced role off the bench. San Antonio will go back to its regular lineup Monday, and Duncan will likely return to his normal role of 20-25 minutes off the bench.

Duncan did not start Saturday against the Warriors, according to Jeff McDonald of the San Antonio Express-News.

It was expected that Duncan would start Saturday as usual, but head coach Gregg Popovich decided to switch things up to counter the Warriors' small lineup and went with Boris Diaw instead.

Duncan (rest) won't play Tuesday against the Timberwolves.

On the second night of a back-to-back set, the Spurs will rest Duncan, along with Manu Ginobili, while Tony Parker will sit out with a left toe contusion. With Duncan on the sideline, expect David West and Boris Diaw to see slight increases in minutes.

Duncan (rest) will not play Saturday against the Kings.

The Spurs are resting LaMarcus Aldridge and Danny Green as well Saturday. Look for David West and Boris Diaw to get the starts in the frontcourt Saturday.

Duncan finished with six points (3-7 FG) and six rebounds in just under 25 minutes during Saturday's win against the Rockets.

After notching a double-double during Friday's win, the 39-year-old took it easy on the second night of a back-to-back. Although he did play 25 minutes, it would have been surprising to see head coach Gregg Popovich heavily utilize Duncan for a second consecutive night.