Rafael Nadal handed first grand slam defeat of the season by Frances Tiafoe

The Spaniard was looking for his third slam title of the year after winning the Australian Open and French Open.

Frances Tiafoe produced a big shock at the US Open (Eduardo Munoz Alvarez/AP)

American Frances Tiafoe stunned Rafael Nadal to hand the 22-time major champion his first grand slam defeat of the season in the fourth round of the US Open.

Nadal was looking for his third slam title of the year after winning the Australian Open and French Open to take the lead in the overall race but he was overpowered by Tiafoe in a 6-4 4-6 6-4 6-3 victory.