Oklahoma City Thunder (64-18, first in the Western Conference) vs. San Antonio Spurs (62-20, second in the Western Conference)San Antonio; Sunday, 8 p.m. EDTLINE: Spurs -1.5; over/under is 219.5WESTERN CONFERENCE FINALS: Thunder lead series 2-1BOTTOM LINE: The Oklahoma City Thunder visit the San Antonio Spurs in the Western Conference finals with a 2-1 lead in the series. The Thunder won the last matchup 123-108 on Saturday, led by 26 points from Shai Gilgeous-Alexander. Victor Wembanyama led the Spurs with 26.The Spurs are 36-16 in conference games. San Antonio ranks fourth in the Western Conference at limiting opponent scoring, giving up just 111.5 points while holding opponents to 45.1% shooting.The Thunder are 41-11 in conference play. Oklahoma City is fifth in the NBA scoring 119.0 points per game while shooting 48.4%.The Spurs make 48.3% of their shots from the field this season, which is 4.6 percentage points higher than the Thunder have allowed to their opponents (43.7%). The Thunder average 7.5 more points per game (119.0) than the Spurs give up to opponents (111.5).TOP PERFORMERS: Wembanyama is averaging 25 points, 11.5 rebounds, 3.1 assists and 3.1 blocks for the Spurs. Stephon Castle is averaging 19.1 points, 5.3 rebounds and 6.8 assists over the last 10 games.Popular ReadsGilgeous-Alexander is sco …