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Five divisional matchups highlight a 14 game NFL Week 3 slate on Sunday, making it the perfect time to use the latest Underdog Fantasy promo code CBSSPORTS2. Among the more intriguing NFL matchups, a pair of unbeatens battle when the Arizona Cardinals meet the San Francisco 49ers in a key NFC West matchup. Other divisional games include Texans vs. Jaguars, Falcons vs. Panthers, Colts vs. Titans and Broncos vs. Chargers. The Underdog Fantasy promo code varies by location, but includes a potential Play $5, get $50 offer. Regardless of your location, using the Underdog Fantasy bonus code CBSSPORTS2 will ensure you get the best Underdog Fantasy promo code available in your state. Click here to get the latest Underdog Fantasy promo code for new users:

How to claim the Underdog Fantasy bonus code on Sunday, September 21

After downloading the Underdog Fantasy app, here's how to get started and use the Underdog promo code CBSSPORTS2. Follow these steps to claim your Underdog Fantasy deposit match bonus. 

  1. How to get started: click the CLAIM BONUS button below to access the latest offer and be redirected over to Underdog or click here.
  2. How to enter the Underdog bonus code: click "sign up" and enter your information to create an account. Then tap or click the 'Add Promo Code' button. Type in CBSSPORTS2.

  3. How to activate the Underdog bonus code for new users: If you have a Play & Get offer, enter any contest of $5+ to activate your welcome bonus.

Get started here:

Best NFL Underdog Fantasy picks for September 21

WR Marvin Harrison Jr., Arizona Cardinals, 0.5 rushing + receiving touchdowns - Higher (1.41x)

Harrison has been a weapon for the Cardinals. In 19 career games, he has 69 receptions for 983 yards (14.2 average) and nine touchdowns. In a season-opening 20-13 win over the New Orleans Saints, Harrison caught five passes for 71 yards and a score. He has registered a touchdown catch in two of his last three games, including in last year's 47-24 win over the 49ers on Jan. 5. Pick it at Underdog:

RB Christian McCaffrey, San Francisco 49ers, 4.5 receptions - Lower (1.11x)

McCaffrey has caught five or more passes in both games this season, but failed to reach that number in three of his four games last year. In 97 career games, he has 539 receptions for 4,591 yards and 30 touchdowns. He has five or more receptions in five of seven career games against Arizona. Running backs, however, have just nine catches through two games this season against the Cardinals defense. Click here to sign up for Underdog Fantasy:

QB Dak Prescott, Dallas Cowboys, 1.5 passing touchdowns - Lower (1.11x)

Prescott is coming off a two-touchdown performance in the passing game in a 40-37 overtime win over the New York Giants last week. Prescott has thrown for two or more touchdowns in a game in five of his last eight. In 124 career games, Prescott has thrown for 215 touchdowns. In his last matchup against the Bears in 2022, he threw for 250 yards and two touchdowns. Combine picks for a parlay on Underdog Fantasy for a potential payout of 10.39x.

With football season now here, the SportsLine Projection model also offers picks for every NFL picks for every game on the slate, which you can use to help guide you in making NFL picks on Underdog Fantasy.