World number one Carlos Alcaraz surged into the last 16 of the US Open on Saturday as Tunisia's Ons Jabeur kept her dream of a first Grand Slam title alive with victory in a three-set thriller. Alcaraz, looking to become the first man to successfully defend the title since Roger Federer in 2008, produced a flurry of magical shots en route to dispatching British 26th seed Dan Evans 6-2, 6-3, 4-6, 6-3. It was another stylish victory for the 20-year-old Spaniard, who will face Italy's Matteo Arnaldi in the fourth round on Monday.