McGregor joins a host of other celebrities who have failed to throw competent opening pitches.
Diana Taurasi and Sue Bird also signed the friend-of-the-court brief.
Machado and Tatis exchanged heated words on Saturday.
DeChambeau's coach claims he wants an end to the drama.
The women's team's gender discrimination lawsuit was dismissed.
The decision comes after the Sha'Carri Richardson case earlier this year.
The Raiders won by a touchdown in overtime.
Djokovic put out of the top spot by the world no. 2.
Raducanu did not drop a single set against Fernandez.
Djokovic will play world no. 2 Medvedev in the final on Sunday.