With her victory in Atlanta, Thomas, who competes for the University of Pennsylvania, became the first openly transgender woman to win an N.C.A.A. swimming championship.
Losing last year’s season to the pandemic, and other Ivy League rules, led to an exodus of talent. One of those players, Paul Atkinson, hit a game-winning shot for Notre Dame in the N.C.A.A. tournament.
The only Division I league to not play football last season because of the pandemic, the Ivy League endured an unusual journey of virus disruptions in its return.