No sooner had Carlos Alcaraz advanced to the Australian Open quarterfinals with a win over Tommy Paul, than attention turned to his serve. The top-ranked Alcaraz, in Australia trying to complete a career Grand Slam at the age of 22, has been remodeling it a little bit. It worked well for him on Sunday in a 7-6 (6), 6-4, 7-5 win over No. 19-seeded Paul.
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