PHILADELPHIA -- The Washington Nationals moved down the map geographically and up in the standings.
Jose Vidro led off the 10th inning with a homer, leading the Nationals to their second consecutive win, 5-4 over the Philadelphia Phillies on Thursday.
Vidro had three RBI and Brad Wilkerson continued his torrid hitting, going 4-for-5 a day after hitting for his second career cycle.
"To come back and win, that's a pretty good feeling because it shows we matured a lot," Vidro said.
Washington, which moved during the offseason after 36 years as the Montreal Expos, completed its first series by winning two of three. Though 159 games remain, the Nationals are tied for first in the NL East with Atlanta.
The Nationals play their home opener at RFK Stadium on April 14 against Arizona. Washington hadn't had a major-league team since the expansion Senators left for Texas following the 1971 season.
"That's what we want to do, win series," Nationals manager Frank Robinson said. "It would've been disheartening if we lost."
Placido Polanco had a go-ahead RBI single in the seventh for the Phillies, but reliever Tim Worrell blew another one-run lead in the eighth.
Vidro hit a 1-2 pitch off Rheal Cormier (0-1) into the left-field seats to start the 10th. Chad Cordero (1-0) pitched two scoreless innings for the win.
"I tried to bunt for a hit," Vidro said. "Once I got two strikes, I was just trying to get a hit. I got an inside pitch and hit it pretty good."
Polanco's two-out RBI single off Esteban Loaiza gave the Phillies a 4-3 lead in the seventh. But the Nationals answered in the eighth against Worrell, who allowed four runs and retired just one batter a night earlier.
Jose Guillen, who hit a go-ahead, two-run homer off Worrell in the eighth inning Wednesday night, led off the eighth with a triple. Nick Johnson's groundout off the first base bag drove in Guillen to tie it at 4.
"The bullpen is the strength of our club. It's just a bump in the road," Phillies manager Charlie Manuel said. "I have all the confidence in the world in our bullpen."
Wilkerson singled, doubled and singled in his first three at-bats, extending his streak to seven consecutive hits before striking out. He also singled off Billy Wagner in the ninth.
"I feel like if I stay within myself, I see the ball a lot better," Wilkerson said.
Loaiza allowed four runs and five hits in 6 2/3 innings, an encouraging outing for the former All-Star playing for his third team since the start of last season.
The right-handed Loaiza was 10-7 with a 5.70 ERA for the White Sox and Yankees last season, a year after he won 21 games, was the AL starter in the All-Star game and finished second in Cy Young award voting behind Toronto's Roy Halladay.
"He was fine. I'll take that from him," Robinson said.
Phillies starter Randy Wolf allowed three runs and eight hits, striking out six in six innings. The former All-Star left-hander is coming off an injury-plagued season in which he was just 5-8 with a 4.17 ERA.
"We're 1-2, but if our starting staff can stay on this pace, we'll be fine," Wolf said.
Loaiza retired the first 12 batters before Jim Thome lined a double to start the fifth. Pat Burrell's two-run single in the sixth tied it at 3.
Vidro's RBI single in the first gave Washington a 1-0 lead. Wilkerson had an RBI single in the fifth and Vidro added a sacrifice fly one out later to make it 3-0.