A spot in the next round is at stake on Tuesday, when Alexander Zverev goes up against Luciano Darderi in the US Open round of 16. Alexander Zverev is 7-3 across recent matches. Luciano Darderi has won 3 in a row and 6 of the last 10 overall.
The serve is where this match separates: Zverev has been winning 73.7% of first-serve points to Darderi's 69.8%, and on hard that gap compounds fast. Darderi needs several things to break right at once; the percentages say they usually don't.