Murray and Del Potro through at US Open

Andy Murray was far from his best in a 7-6 (7), 5-7, 6-2, 6-3 win over Pablo Lorenzi at Flushing Meadows.

The second seed booked his spot in the fourth round of the US Open, but he had it far from all his own way at Arthur Ashe Stadium on Saturday night.

Murray coughed up 63 enforced errors against his Italian opponent, and was broken twice in a match that lasted over three hours.

The Scot will face Bulgaria’s Grigor Dimitrov for a place in the quarter-finals at Flushing Meadows. Dimitrov beat Joao Sousa of Portugal 6-4, 6-1, 3-6, 6-2 earlier in the day.

Unseeded Juan Martin Del Potro of Argentina reached the fourth round after defeating 11th seed David Ferrer in straight sets.

Del Potro, a former champion in New York, beat Spain's Ferrer 7-6(3) 6-2 6-3 in a match lasting two hours and 28 minutes.

In the opening set, there were two breaks of serve each before the game progressed to a tie-break which Del Potro won 7-3 to claim the first set 7-6.

Things went with serve until the sixth game of the second set where Ferrer dropped serve, the Argentine then held serve to lead 5-2 then broke the 11th seeds serve again to claim the set 6-2.

In the third, a solitary service break in the eighth game was all Del Potro needed to seal his spot in the fourth round and a clash against Austrian eighth seed Dominic Thiem.

Earlier in the day, Thiem needed four sets to defeat Pablo Carreno of Spain 1-6, 6-4, 6-4, 7-5.

After getting thumped 6-1 in the opener, after dropping serve in the second and fourth games, Thiem turned things around with two breaks of serve in the second set to win it 6-4.

In the 10th game of the third set, Carreno lost his serve to hand the set to the eight seed 6-4.

In a topsy-turvy fourth, there were five breaks of serve before Thiem claimed the set and match 7-5 to reach the fourth round.