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.
Defending champion Jannik Sinner lost his second-round match on grass at Halle on Thursday to Kazakhstan's Alexander Bublik, the Italian's first tournament since his French Open final defeat.
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.
World number one Jannik Sinner wants to use the Halle Open as a chance to bounce back from sleepless nights after his agonising loss to rival Carlos Alcaraz in the French Open final this month.
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.
Defending champion and top seed Jannik Sinner overcame a debilitating medical episode as well as Dane Holger Rune to reach the quarter-finals of the Australian Open for the third time with a 6-3 3-6 6-3 6-2 victory on Monday.
The first Grand Slam of the year gets under way at Melbourne Park as a 15-day event for the second year running, aimed at cutting down on late-night finishes.
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.
For over two decades, the "Big Three" of Roger Federer, Rafael Nadal, and Novak Djokovic dominated the sport, pushing each other to unimaginable heights. Now, a new story begins.
Zverev trails world number one Italian Jannik Sinner by more than 3,000 ranking points, but his confidence is high after winning the Rome and Paris Masters 1000 titles in recent months.
Novak Djokovic is ready to challenge Jannik Sinner and Carlos Alcaraz at the Grand Slam stage when he returns to action at the Australian Open after an underwhelming campaign this year, the 24-times champion said.
The world number one eased to a 7-6 (7/2), 6-2 triumph against Tallon Griekspoor for the winning point after Matteo Berrettini had put the defending champions ahead with a convincing 6-4, 6-2 win against Botic van de Zandschulp.
World number one Jannik Sinner was described as a "puzzle that not many have solved" after defeating Alex de Minaur to power holders Italy into the Davis Cup final with a 2-0 victory over Australia on Saturday.
Sinner has so far managed fears that a ban might bring his career to a shuddering halt.
Sinner, who lost last year's final to Novak Djokovic, did not put a foot wrong this time round as he finished undefeated and without dropping a set to earn $4,881,500 in prize money.
