Frances Tiafoe celebrates his first career grass-court title at the ATP Challenger Tour event in Nottingham.

Frances Tiafoe claims his first career grass-court title at the ATP Challenger event in Nottingham.

Frances Tiafoe claims his first career grass-court title at the ATP Challenger event in Nottingham.

Frances Tiafoe does not face a break point in his first-round victory against Facundo Bagnis on Tuesday in Buenos Aires.

Frances Tiafoe struck 49 winners in his four-set loss to Novak Djokovic at the Australian Open on Wednesday.

Nicholas Monroe (right) and Frances Tiafoe (left) will face Marcelo Melo and Horia Tecau in the Murray River Open second round.

Frances Tiafoe battles hard against Egor Gerasimov on Friday in Nur-Sultan.

Frances Tiafoe upsets second seed Miomir Kecmanovic on Wednesday in the Nur-Sultan second round.

Frances Tiafoe levels his ATP Head2Head series against Corentin Moutet at 1-1.

Frances Tiafoe wins his opening match in Antwerp.

Frances Tiafoe won 83 per cent of his first-serve points en route to a straight-sets victory against Dusan Lajovic in Antwerp.

Frances Tiafoe lifts the trophy at the ATP Challenger Tour event in Parma.

Frances Tiafoe returns to the winners' circle in Parma.

Tommy Paul and Frances Tiafoe celebrate during their first-round doubles match at the Western & Southern Open.

Frances Tiafoe will partner Tommy Paul in the Western & Southern Open doubles draw.

Frances Tiafoe is making his fourth straight appearance in the Western & Southern Open main draw.

Frances Tiafoe looks for revenge against Alex de Minaur in their semi-final clash at the Next Gen ATP Finals.

Frances Tiafoe didn't drop serve en route to defeating Mikael Ymer at the Next Gen ATP Finals.

Frances Tiafoe keeps himself in contention to advance out of Group B with a win over Ugo Humbert.

The third edition of the Next Gen ATP Finals will take place from 5-9 November at Allianz Cloud, Milan.

(L to R): Mikael Ymer, Jannik Sinner, Alejandro Davidovich Fokina, Frances Tiafoe, Ugo Humbert, Miomir Kecmanovic and Casper Ruud attend the draw party for the 2019 Next Gen ATP Finals.

Frances Tiafoe and Guido Pella are both making their third straight appearances at the European Open.

Fifth seed Frances Tiafoe attends kids' day at the BB&T Atlanta Open.

Frances Tiafoe defeats Joao Sousa for the first time to advance in 's-Hertogenbosch.

Frances Tiafoe upsets 14th seed Nikoloz Basilashvili in exactly two hours to reach the second round in Madrid.