1. LA Galaxy vs. LAFC, MLS (1,987,000)
2. Michigan vs. Loyola, Ill., NCAA men's basketball (1,596,000)
3. Kansas vs. Villanova, NCAA men's basketball (1,480,000)
4. Notre Dame vs. Mississippi State, NCAA women's basketball (1,129,000)
5. Houston Rockets vs. San Antonio Spurs, NBA (1,118,000)
Data: TV sports events across Facebook, Instagram, and Twitter.
Source: Nielsen Social.