Carlos Alcaraz has notched the biggest win on the ATP Tour…

The 18-year-old Spanish tennis player claimed a fifth set tiebreaker to stun third seed Stefanos Tsitsipas in a thrilling third-round match at the US Open.

Alcaraz prevailed 6-3, 4-6, 7-6 (7-2), 0-6, 7-6 (7-5) to set up his first Grand Slam fourth-round appearance.

Alcaraz became the youngest man to reach the French Open third round since 1992 in June – and he nce again demonstrated why he’s being tipped for future glory as he shocked the world number three at Arthur Ashe Stadium.

Alcaraz twice led Tsitsipas, who reached his first Grand Slam final at Roland Garros earlier this year, by a set and showed maturity well beyond his years as he also recovered from failing to take a game in the fourth.

Roared on by a partisan crowd, the talented Spaniard survived a break point at 3-2 down in the deciding set and showed no sign of tension as he held serve to force the final tie-break.

In a dazzling display Alcaraz landed 61 winners and, after more than four hours of play, clinched his third match point with an assured forehand winner to set up a fourth-round meeting with German Peter Gojowczyk.

“I think without this crowd I haven’t the possibility to win the match,” said Alcaraz. “I was down at the beginning of the fourth set so thank you to the crowd for pushing me up in the fifth.

“It’s an incredible feeling for me. This victory means a lot to me. It’s the best match of my career, the best win, to beat Stefanos Tsitsipas is a dream come true for me.”