Andy Murray came back from a set down to beat Denis Istomin 6-7 (5-7) 6-1 6-4 6-4 and book his spot in the quarter-finals of the US Open.
Watch the 2013 US Open live only on Sky Sports. Upgrade to Sky Sports on Sky and get Sky Broadband Unlimited FREE FOR 12 MONTHS. Click here to sign upUS Open: Andy Murray through to quarter-finals after four-set win over Denis Istomin