John Isner will be back in action one day after upsetting Roger Federer as he goes up against David Ferrer in the Paris quarterfinals on Friday. The schedule also features a showdown between Andy Murray and Richard Gasquet.

(8) David Ferrer vs. (13) John Isner

A season that began with two utterly dismal months could end with Isner being one of two alternates at the World Tour Finals. The world No. 13 kept that chance alive in improbable fashion on Thursday, when he upset Roger Federer 7-6(3), 3-6, 7-6(5) to reach the quarterfinals of the BNP Paribas Masters. Through two matches this week, Isner has 48 aces and just one-double fault. The 6’10” American is a stellar 45-25 for the year; for those counting, that means he has won more than two out of every three matches (42-20) since starting the 2015 campaign 3-5.

Up next for Isner on Friday afternoon is a…