Answer:
tackle (football, soccer)
touchdown (football)
touchback (football)
technical (foul)
time-out
third down (football)
third quarter
third base (baseball)
third baseman
third-string
triple lutz (figure skating)
triple (a three-base hit in baseball)
triple jump
triple-A ball (minor league baseball)
three-second violation (basketball)
toothless (like a hockey player)
T-ball
trifecta
tennis
tennis-elbow
tendonitis
throw
throw in (soccer)