<p>Daniil Medvedev, who has become only the third Russian to be crowned men's tennis world number one, said his sport was not important given his country's invasion of Ukraine.</p>.<p>The 26-year-old -- who will on Monday officially replace long-time number one Novak Djokovic after the Serb lost in the quarter-finals of the Dubai tournament -- said his head was full of emotions when he woke up to the news of his country's offensive on Thursday.</p>.<p>"At this stage, one understands that tennis is sometimes not so important," said Medvedev after winning his quarter-final in the Acapulco Open.</p>.<p>"I woke up (Thursday) with a lot of emotion swirling inside me."</p>.<p>Rafael Nadal -- who beat Medvedev to win a record 21st Grand Slam singles title in last month's Australian Open final -- said he could not believe wars were necessary for the 21st century.</p>.<p>"It is sombre news," said the Spaniard after he too won his quarter-final in Acapulco.</p>.<p>"I do not want to speak of who is guilty or of the problem itself, but it feels to me unbelievable that in this century we are living that there are wars.</p>.<p>"I cannot understand it. I hope that it will finish as soon as possible.</p>.<p>"The only thing I wish for, is there will be as few people affected and killed as possible."</p>.<p>Russian President Vladimir Putin defied Western warnings to unleash a full-scale ground invasion and air assault on Thursday that quickly claimed dozens of lives and displaced at least 100,000 people.</p>.<p><strong>Check out the latest videos from <i data-stringify-type="italic">DH</i>:</strong></p>
<p>Daniil Medvedev, who has become only the third Russian to be crowned men's tennis world number one, said his sport was not important given his country's invasion of Ukraine.</p>.<p>The 26-year-old -- who will on Monday officially replace long-time number one Novak Djokovic after the Serb lost in the quarter-finals of the Dubai tournament -- said his head was full of emotions when he woke up to the news of his country's offensive on Thursday.</p>.<p>"At this stage, one understands that tennis is sometimes not so important," said Medvedev after winning his quarter-final in the Acapulco Open.</p>.<p>"I woke up (Thursday) with a lot of emotion swirling inside me."</p>.<p>Rafael Nadal -- who beat Medvedev to win a record 21st Grand Slam singles title in last month's Australian Open final -- said he could not believe wars were necessary for the 21st century.</p>.<p>"It is sombre news," said the Spaniard after he too won his quarter-final in Acapulco.</p>.<p>"I do not want to speak of who is guilty or of the problem itself, but it feels to me unbelievable that in this century we are living that there are wars.</p>.<p>"I cannot understand it. I hope that it will finish as soon as possible.</p>.<p>"The only thing I wish for, is there will be as few people affected and killed as possible."</p>.<p>Russian President Vladimir Putin defied Western warnings to unleash a full-scale ground invasion and air assault on Thursday that quickly claimed dozens of lives and displaced at least 100,000 people.</p>.<p><strong>Check out the latest videos from <i data-stringify-type="italic">DH</i>:</strong></p>