The annual event, which was started in 1972 and is named after the most accomplished tennis player in Mexican history, Rafael Osuna, pits former college standouts, national champions and Davis Cup ...

The day and night of upsets leaves the tournament wide open with only two-seeded players remaining: No. 8 Tomas Machac, the world No. 25, and No. 9 Denis Shapovalov, ranked No. 32.