Frances Tiafoe showed no signs of fatigue as he saw off Hyeon Chung and Denis Shapovalov to win through to the Delray Beach Open final.

It was a busy day for Tiafoe, who defeated Australian Open semi-finalist Chung in their rain-interrupted quarter-final Saturday before upstaging Canadian sensation Shapovalov.

Tiafoe's clash with South Korean star Chung was suspended due to rain as he led 5-7 6-4 5-3 Friday.

The 20-year-old American – who upstaged Juan Martin del Potro en route to the decider – needed eight match points to complete a 5-7 6-5 6-4 victory on the weekend.

Tiafoe backed up that performance with a 7-5 6-4 win against teenager Shapovalov at the ATP 250 tournament.

The wildcard won 84 per cent of his first serves, while he converted three of five break points to set up a meeting with Germany's Peter Gojowczyk.

Gojowczyk – who eliminated sixth seed John Isner in the second round – accounted for American Steve Johnson 7-6 (7-3) 6-3 in their semi-final encounter.