Ben Shelton beats Lorenzo Sonego to reach Australian Open semi-finals

“I feel relieved right now,” said Shelton.

Ben Shelton has reached the last four of a Grand Slam for the second time (Asanka Brendon Ratnayake/AP)

Ben Shelton battled to a four-set win over Lorenzo Sonego to reach his second grand slam semi-final.

The big-serving American made his breakthrough at the Australian Open two years ago with a run to the quarter-finals on his debut before bettering that at the US Open.