Seventh seed Matteo Berrettini overcame Spanish prospect Carlos Alcaraz in an enthralling five-set battle to reach the Australian Open fourth round.
Italian Berrettini opened a two-set lead before 18-year-old Alcaraz, the youngest man in the draw, fought back to take it to a thrilling fifth.
Berrettini held his nerve in the deciding tie-break to win 6-2 7-6 (7-3) 4-6 2-6 7-6 (10-5) on Rod Laver Arena.
"He is unbelievable," said 25-year-old Berrettini of his teenage opponent.
"He is impressive and will only improve playing matches like this, he has shown everyone his potential. Luckily today I won.