Djokovic does not give up despite physical decline

Djokovic showed clear signs of weakness at the end of the second set of tie-break series, when he constantly had to move to save the ball. He lost this set and then collapsed on the rest bench. The 35-year-old's condition did not improve much in the third set, worrying his team in the stands.

"The thought of giving up to keep up the semi-finals never crossed my mind," Djokovic said after beating Medvedev 7-2 in the third set tie-break. "We want to win, even if he's eliminated. At this age, every win against top players is precious to me."

When asked what health problems he had, Djokovic said he was tired. The Serbian tennis player trembled while holding a drink bottle, constantly panting and had to bend over. Djokovic will not have a day off when he meets Taylor Fritz in the semi-finals at 8 pm today, Hanoi time.

Djokovic believes that great champions must cross the line of challenges, as he and Rafael Nadal have shown over the years. Nole said: "I don't believe there are limits. It's just a matter of your head, the way you see things and your perception. Physicality is important, it affects senses, body language. But The biggest battle is always inside. You have to optimize it often."

Medvedev once lost to Nadal in the Australian Open final this season despite leading two sets and dominating the first half of the third set. In the match against Djokovic yesterday, the Russian player held the serve to end the match but lost his rhythm and was removed 5-5.

Medvedev lost his eighth game in a row against top 10 opponents. His form has seriously declined this season, after disc surgery and bans earlier this year. Medvedev won 45, lost 16 matches and won only two titles, the minor ones in Vienna and Los Cabos.

Djokovic has a chance to win his fifth title of the season and sixth in the ATP Finals. By winning all three group stage matches, the Serbian tennis player will also hold a record prize of $ 4.7 million if crowned.