In the biggest upset of the tournament so far, Maria was defeated in the second round by Daria Gavrilova of Russia at the Miami Open. Maria lost 6-7 3-6 in an hour and 49 minutes.
There were four breaks of serve in the first set which was eventually decided by a tie-break which Gavrilova won 7-4. In the second set, Gavrilova had a 4-1 lead. Maria won the next two games to get the set back on serve. At 4-3, Gavrilova won the two games she needed to get the win.