Serena Williams absolutely destroyed her opponent at the U.S. Open on Tuesday ... and NO ONE was happier for her than Tiger Woods ... who was losing his mind in the stands!!
The golf legend has been a spectator at the major tournament with his GF, Erica Herman, and his 10-year-old son, Charlie, this week ... even geeking out over meeting Rafael Nadal after his match on Monday.
Serena's 44-minute-long quarterfinal match against Wang Qiang was no different ... with Woods front and center for Williams' 6-1, 6-0 dominant performance ... and giving his classic fist pump celebration during the match!!