Miami Open champion Jakub Mensik, 19, and 18-year-old Brazilian Joao Fonseca are two teenagers McEnroe could envision breaking into the Alcaraz-Sinner rivalry, as well as big-serving American Ben Shelton.
Carlos Alcaraz survived a huge scare against fellow Spaniard Jaume Munar as the world number two moved into the Queen's Club quarter-finals with a 6-4, 6-7 (7/9), 7-5 victory on Thursday.
Carlos Alcaraz came through a testing first-round match against Adam Walton at Queen's on Tuesday as the top seed returned to action for the first time since his dramatic French Open triumph.
World number one Jannik Sinner rebounded from his agonising French Open final defeat to Carlos Alcaraz with a straight-sets win at the Halle Open on Tuesday.
Carlos Alcaraz will return to action at Queen's Club next week after the world number two celebrated his epic French Open triumph by partying in Ibiza.
Italian Jannik Sinner said on Sunday he had experienced "a few sleepless nights" since his historic French Open final loss to Carlos Alcaraz.
At five hours and 29 minutes it was the longest final at Roland Garros, smashing the previous record set by Sweden's Mats Wilander when he beat Guillermo Vilas in 1982.
Jannik Sinner said he would try to "delete" the memory of his five-set loss to Carlos Alcaraz in the Roland Garros final on Sunday, after the world number one passed up three championship points as the Spaniard roared back to claim victory.
Carlos Alcaraz saved three championship points as he produced an astonishing fightback from two sets down to beat Jannik Sinner in a French Open final for the ages on Sunday.
A four-time Grand Slam champion, Alcaraz said he was too focused on what weapons British left-hander Jack Draper might bring and unable to calm the pre-match jitters that prevented him from rising to the occasion.
World number three Alcaraz had too much weight of shot off both flanks for his opponent, who retrieved valiantly but lacked the weapons to topple the top seed.
"He has lost only four or five matches in the past year, so it's crazy. I know people say who's better out of us. They say Jannik is better or some say me. It's all discussion."
The 10-time Melbourne Park winner Djokovic outlasted the younger Spaniard 4-6, 6-4, 6-3, 6-4 to set up a semi-final with Alexander Zverev.
Ageless Novak Djokovic won an epic generational clash against Carlos Alcaraz on Tuesday to stay on track for an 11th Australian Open title with Alexander Zverev next in the semifinals.
Jaime Alcaraz Garfia won his first qualifying match at the Les Petits As on Saturday, putting him one victory away from the main draw at an event that is a premier fixture on the Junior European Tour.
The 37-year-old Serb, who is gunning for a record 25th Grand Slam title and 11th Melbourne crown, beat 24th seed Jiri Lehecka 6-3, 6-4, 7-6 (7/4) on Rod Laver Arena.
Alcaraz is bidding to become the youngest man to complete a career Grand Slam -- winning all four majors -- in the Open Era.
The Spanish third seed showed no mercy to Japan's Yoshihito Nishioka, who was taught a 6-0, 6-1, 6-4 lesson on Margaret Court Arena in an 81-minute rout.
Alcaraz won the French Open and Wimbledon titles last year while Sinner claimed the Australian Open and U.S. Open trophies as the pair heralded a new era for the men's game by shutting out 24-times Grand Slam champion Novak Djokovic.
