A spot in the next round is at stake on Tuesday, when Janice Tjen goes up against Yuliia Starodubtseva in the Monterrey round of 16. Janice Tjen is 3-7 across recent matches. Yuliia Starodubtseva is 4-6 across recent matches.

The serve is where this match separates: Tjen has been winning 67.4% of first-serve points to Starodubtseva's 58.2%, and on hard that gap compounds fast. Tjen comes in off a compressed schedule. The edge belongs to Tjen — real, but not the kind you take for granted at this level.