NBA Best Player Prop Picks, Odds, Predictions for Monday, May 18, 2026
With the semifinal round now in the books, we’re primed for the start of the conference finals Monday night. The Thunder come off a long layoff and fresh off a second straight MVP for star guard Shai Gilgeous-Alexander and host the Spurs, who just wrapped up a hard-fought six game series against the Timberwolves.
As customary, we zero in on three player props to consider for tonight’s action. Also, be sure to check out our daily NBA betting trends page for odds and data on every game.
Monday’s Best NBA Player Props
- Stephon Castle (SAO) – Over Points + Rebounds + Assists
- Victor Wembanyama (SAO) – Under Points + Rebounds
- Isaiah Hartenstein (OKC) – Over Points + Rebounds
2026 Playoff Prop Bet Tracker: 47-34 (+8.77 units)
Stephon Castle (SAO) – Over Points + Rebounds + Assists
Castle has been the epitome of consistency throughout the first two rounds of the postseason, serving as a complementary source of all-around production via his averages of 19.9 points, 6.1 assists and 4.9 rebounds across 31.8 minutes per contest. The second-year pro has shot 49% overall, including a stellar 44% from behind the arc. Between his field-goal attempts and opportunities at the line, Castle is putting up a combined 19.3 shots per contest, affording him plenty of opportunity on the offensive end.
Castle is also pulling down 48.6% of his 10.1 rebounding opportunities per contest, and he’s dished out at least five assists in nine of 11 playoff games. He also had a solid body of work against OKC during the regular season, producing 28.6 points + rebounds + assists over 31.2 minutes per contest in five games while shooting 54.5%, including 42.9% from three-point range. Castle was just one point, rebound or assist short of going 4-1 to the Over on 27.5 in that span, and he’s also 4-1 to the number in his last five postseason tilts.
Original Line Publish: 27.5
Victor Wembanyama (SAO) – Under Points + Rebounds
Wembanyama is naturally the force the Spurs’ fortunes revolve around, and he’s often been dominant on both ends of the floor through the first two series of the postseason. Among his standout individual efforts, Wemby has 35- and 39-point tallies, along with six double-doubles and four tallies of 15+ rebounds. Even with a pair of 12-minute stints on the floor, the 2023 first overall pick is averaging 31.0 points + rebounds per contest, but that number is far below his line for this Game 1 clash.
Additionally, Wemby’s resume against OKC in the regular season doesn’t exactly inspire confidence in the Over. He went 0-5 to the Over on the 37.5 in that sample, averaging 27.6 points + rebounds across 25.2 minutes per game. He’s also been under 37.5 points + rebounds in six of the last seven postseason games, and the Thunder are ranked No. 1 in offensive efficiency rating allowed to centers since the start of the regular season (27.4) while giving up 33.1 points + rebounds per game to the position.
Original Line Publish: 37.5
Isaiah Hartenstein (OKC) – Over Points + Rebounds
While we’re viewing Wembanyama’s PR line as a bit elevated, the opposite is the case with his well-rested opposite number. Hartenstein put together a solid regular season in his complementary role and has been even more productive at times during the postseason. He comes into the conference finals riding a particularly productive stretch of play, averaging 10.6 points, 9.8 rebounds, 3.0 assists and 1.6 steals across 28.0 minutes per game dating back to Game 4 of the first-round series against the Suns.
Hartenstein is pulling down 50.4% of his 17.4 rebounding opportunities per game this postseason, which affords him a rock-solid floor in that category. That’s been evidenced by his five straight tallies of 9+ rebounds coming into Monday, and he’s also posted a trio of double-digit scoring tallies thus far in the postseason. He also had a good track record against the Spurs over his three regular-season meetings against them, averaging 21.3 points + rebounds across 23.3 minutes per contest while going 3-0 to the Over on the 16.5. He’s also 4-1 to the Over on the number in the last five games, making this a very viable play.
Original Line Publish: 16.5
Photo Credit: AP/Mark J. Terrill
