A spot in the next round is at stake on Tuesday, when Daniel Vallejo goes up against Tommy Paul in the Cincinnati round of 32. Tommy Paul comes in at 6 wins from the last ten. Daniel Vallejo has won 6 of the last 10.
The serve is where this match separates: Paul has been winning 69.4% of first-serve points to Vallejo's 64.9%, and on hard that gap compounds fast. Paul should have enough here, though Vallejo has the tools to make the scoreboard uncomfortable.