WNBA Player Props & Best Bets Today for May 21: Thomas Helps Make Mercury Rise

Alyssa Thomas has seemingly fit right in with Phoenix, and our WNBA betting picks see her ability to set up teammates coming to the fore vs. the Sparks tonight. Plus, prop plays for Courtney Williams and Kiki Iriafen.

Jason Logan: Senior Betting Analyst at Covers
Jason Logan • Senior Betting Analyst
May 21, 2025 • 12:26 ET • 4 min read
Phoenix Mercury WNBA Alyssa Thomas
Photo By - Imagn Images. Phoenix Mercury forward Alyssa Thomas with the ball.

The 2025 WNBA season is off and running with three games on the betting board this Wednesday.

The Minnesota Lynx host the Dallas Wings, the Washington Mystics cross the country to visit the Golden State Valkyries, and the Los Angeles Sparks battle the Phoenix Mercury in a wild west shootout.

I put player performance under the microscope and give you my best WNBA picks and player prop predictions for May 21.

WNBA player prop bets for May 21

  • Suns Williams o13.5 pts (-130) 
  • Suns Thomas o8.5 asts (-102)
  • Suns Iriafen u14.5 pts (-114)

Today's best WNBA player props bets

Courtney Williams Over 13.5 points (-130 at DraftKings)

The Minnesota Lynx are still without Kayla McBride to start the season but are 2-0 thanks to Courtney Williams stepping up her role in the Minnesota offense. 

Williams, who averaged just over 11 points last season, dropped 25 points on this very same Dallas Wings defense in the season opener and put up 13 points in the win over L.A. on the weekend. 

She’s seen a spike in shot attempts, putting up 15 and 19 FGAs in those respective outings, and could be called upon to carry more of the scoring load with Alanna Smith nursing a quad injury tonight.

The Wings were absolutely rolled in their last matchup with Minnesota, with the Lynx scoring 99 points on 53% shooting. Dallas’ defensive chemistry is a work in progress with so many new faces in the starting lineup.

Williams isn’t going to have the same offensive eruption as that first game with the Wings, but player projections call for more than 15 points from the veteran guard. The ceiling is even higher considering her touches will grow if Smith is slowed.

Alyssa Thomas Over 8.5 assists (-102 at FanDuel)

Alyssa Thomas’ first career game not in a Connecticut Sun uniform held up to her future Hall of Fame standards. 

The newest member of the Phoenix Mercury stuffed the stat sheet against Seattle with 20 points, seven rebounds, and six assists in the season-opening victory last Saturday. 

Thomas has to play a bigger role in the Phoenix attack with star Kahleah Copper recovering from offseason surgery, which means more touches and more opportunities to make plays. 

The Mercury scored 81 points against what should be a very sound Seattle defense in the first game, despite that matchup being played at a slow pace. Los Angeles will play at a quicker tempo and there will be an increase in possessions. The Sparks defense allowed 27 assists on 34 made FGAs from Minnesota last time out.

Player models aren’t bullish on her assists, but without Cooper the ball will always be with Thomas, who averaged eight dimes per game the past two seasons. She played 30 minutes in the blowout win over the Storm, so expect her floor time to increase in what oddsmakers are predicting as a close game.

Kiki Iriafen Under 14.5 points (-114 at FanDuel)

The Washington Mystics rookie forward has been fantastic in the first two games of the season, getting plenty of run and touches in a frontcourt thinned by injuries.

Second-year forward Aaliyah Edwards is still out with a back injury, but center Shakira Austin returned to action last time out. She came off the bench versus Connecticut for just seven minutes before being ejected early in the third quarter.

Austin is no longer on the team’s injury report heading into this coast-to-coast trip to play the Golden State Valkyries and will eat up minutes and touches for Washington, taking the ball away from Iriafen, who scored 17 points in that win over the Sun.

This game in San Francisco is somewhat of a homecoming for Kiki Iriafen, who played ball at Stanford before transferring to USC. Her player projections are solid, but coming in short than the inflated 14.5-point total.

Models range from 12.6 to 13.18 points for Iriafen, giving us good value on the Under 14.5 points.

Today’s WNBA games

Odds are correct at the time of publishing and are subject to change.
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Jason Logan Senior Industry Analyst Covers.com
Senior Betting Analyst

In his 20 years with Covers, lead NFL betting analyst “JLo” has seen it all and bet it all. Through the wild west of early Internet gambling to lobbying for legalized sports betting to our brave new wagering world, Jason has been a consistent source of actionable info and entertainment for squares and sharps alike.

Since joining the Covers team back in 2005, he’s honed his handicapping skills to provide audiences with the most thorough insights, blending traditional capping methods with advanced modelling and predictive analysis. Jason has studied the ins and outs of the sports betting business, learning from some of the most successful gamblers in the industry and the biggest sportsbook operators on the planet.

He is under center for Covers during NFL season as our top NFL expert, taking the points in his infamous “NFL Underdogs” column and representing the Covers Community at the Super Bowl. While he lives for football season, Jason’s first love is basketball and that shows in his in-depth NBA, NCAA, and WNBA betting breakdowns.

On top of being a mainstay in media from coast to coast – WPIX, PHL17, Fox 5 San Diego, WGNO, TSN, SportsNet, ESPN Radio – he’s had his analysis featured in USA Today, MSNBC, ESPN, the Wall Street Journal, CBS, Bloomberg, the L.A. Times, the New York Times and other major publications. You can also find JLo stuffing all the top picks and predictions he can into 10 minutes as the host of Covers’ flagship podcast, The Sharp 600.

His best advice for bettors new and old is “Handicapping isn’t a ‘one size fits all’ process. The impact and importance of information varies from bet to bet. Treat each wager different than the last.”

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