Donald Trump supporter Tennys Sandgren has deleted 18 months worth of tweets after his political views were put under the microscope following his unlikely charge into the Australian Open quarter-finals.

After downing No.5 seed Dominic Thiem on Monday to move into the last eight at Melbourne Park, the 26-year-old Sandgren was grilled on his seeming support for the alt-right movement in the United States.

Sandgren said he found some of the online content “interesting” but that he did not support the movement.