A spot in the next round is at stake on Tuesday, when Donna Vekic goes up against Viktorija Golubic in the Toronto round of 64. Donna Vekic is searching for form, having lost 2 in a row (7 of the last 10). Viktorija Golubic comes in at 6 wins from the last ten.
The serve is where this match separates: Vekic has been winning 68.7% of first-serve points to Golubic's 58%, and on hard that gap compounds fast. A tiebreak or two would surprise nobody, with Vekic fractionally more likely to land the big points.