A spot in the next round is at stake on Tuesday, when Daniel Altmaier goes up against Francisco Comesana in the Winston-Salem round of 32. Daniel Altmaier has won 5 of the last 10. Francisco Comesana is 6-4 across recent matches.

On paper it's close: comparable ratings, comparable serve numbers, small margins everywhere. This one is close to a coin flip, and the lean toward Altmaier is exactly that — a lean.