Altered serve an 'important weapon' for Alcaraz

Image caption, Carlos Alcaraz is aiming to complete a career Grand Slam by winning the Australian OpenCarlos Alcaraz says he is pleased to see the recent changes to his serve pay off, describing it as an "important weapon" during his serene run to the last eight of the Australian Open.

A straight-set win over American 19th seed Tommy Paul took world number one Alcaraz into a 14th Grand Slam quarter-final, surpassing the record previously held by Bjorn Borg and Boris Becker (13) for the most of any player in the Open era before turning 23.

After the match, Alcaraz spoke at length about the tweaks he has made to his serve in recent months - joking with the crowd on Rod Laver Arena about the…