A spot in the next round is at stake on Monday, when Shuai Zhang goes up against Yulia Putintseva in the Toronto first round. Yulia Putintseva comes in at 6 wins from the last ten. Shuai Zhang is 4-6 across recent matches.
On paper it's close: comparable ratings, comparable serve numbers, small margins everywhere. A tiebreak or two would surprise nobody, with Putintseva fractionally more likely to land the big points.