Lulu Sun (NZL) v Erika Andreeva (RUS)

Erika Andreeva started her singles quarter-final in Monterrey against Lulu Sun with an ace, but followed that with a couple of unforced errors before going on to win the game.  They both then held to love before Andreeva hit a beautiful inside-out forehand return to take Sun to the first deuce of the match, but…