Klitschko and his brother Vitali, also a former world heavyweight champion and now the mayor of Kyiv, have both taken up arms against invading Russian forces.
Third seeds Mahesh Bhupathi and Rohan Bopanna crashed out of the Aegon Championships after suffering a straight-set defeat at the hands of top seeds Bob and Mike Bryan in the semi-finals.
American twins Bob and Mike Bryan fell short in their bid to capture a calendar-year Grand Slam when they lost to Czech Radek Stepanek and India's Leander Paes in the men's doubles semi-finals.
The 16th seeds, Bopanna and Middelkoop, who have played some exhilarating tennis throughout
Leander Paes created history on Saturday, becoming the first Indian to complete a career Grand Slam by winning the Australian Open men's doubles title with Radek Stepanek.
Leander Paes and Radek Stepanek upset Bob and Mike Bryan 7-6(1), 6-2 to win the Australian Open doubles title on Saturday and foil the American twins' bid for a record 12th Grand Slam crown.
Top seeds Max Mirnyi and Daniel Nestor captured a second successive French Open doubles title by beating American twins Bob and Mike Bryan 6-4, 6-4 in the final on Saturday.
World number 30 Berrettini saved five points in the marathon second set tiebreak and held on to win it 13-11 for his third ATP crown in last 11 months.
They are the Asian counterparts of the Bryan brothers. For the Ratiwatana twins, Sonchat and Sanchai, though the comparisons end right there.
Sharan and Sitak got the better of the Portuguese-Spanish duo 6-4, 7-5 in a thrilling one hour 28 minute encounter.
The Indo-Scottish duo beat Juan Monaco and Todd Perry 7-6(1), 6-7(5), 10-3.
Both were knocked out of the men's doubles in the second round at the Rome Masters.
Indian Davis Cupper Rohan Bopanna and his Pakistani partner Aisam-ul-Haq Qureshi squandered a one-set lead as they went down fighting to top-ranked American pair of Bob and Mike Bryan in the quarter-finals of the men's doubles at the French Open in Paris on Wednesday.
Ace Indian pair of Leander Paes and Mahesh Bhupathi are one step away from securing the lone trophy missing from their cabinets. The third seeds got the better of the second-seeded pair of Daniel Nestor of Cananda and Max Mirnyi of Belarus 7-6, 4-6, 6-3 to make it to the final of the Australian Open.
Mahesh Bhupathi and Mark Knowles' doubles' partnership ended on a disappointing note after the third seeded Indo-Bahamian pair was handed a straight-set defeat by Americans Bob and Mike Bryan in the semi-finals of the ATP World Tour Finals in London. The Bryan brothers, who are two-time former winners at the event, won 6-4, 6-4 on Saturday night at the O2 arena in south-east London.
India's Leander Paes along with his French partner Jeremy Chardy prevailed over Marcel Granollers and Sam Groth in a hard-fought three setter to enter the semifinals of the Delray Beach Open in Florida.
US Davis Cup debutant Sam Querrey will face world number one Rafael Nadal in the opening rubber of the semi-final on Friday.
Argentina, the Czech Republic and Spain also booked their places in the last eight by opening up 3-0 leads.
The United States kept their Davis Cup hopes alive after Mike Bryan and Mardy Fish beat Spain's Fernando Verdasco and Feliciano Lopez on Saturday to reduce the champions' semi-final deficit to 2-1. Fish and doubles world number one Bryan, who was playing his first game without injured twin Bob in six years, silenced a rowdy crowd inside Madrid's Las Ventas bullring by snuffing out a Spain comeback 4-6, 6-4, 6-3, 4-6, 6-4 in 3 hours and 16 minutes.
In his last All England Club campaign, Jonas Bjorkman and partner Kevin Ullyett sent top seeds Bob and Mike Bryan crashing out of Wimbledon to reach the men's doubles final on Thursday. Seeded eighth, Bjorkman of Sweden and Zimbabwe's Ullyett ended the American brothers' hopes of a fourth consecutive Wimbledon doubles final, winning 7-6, 5-7, 7-6, 7-6.
Mahesh Bhupathi and his partner Mark Knowles of The Bahamas squandered a match point en route to an agonising three-set loss to top seeds Bob and Mike Bryan in the semi-finals of the ATP Cincinnati Masters. The fourth seeded Indo-Bahamian pair went down 4-6, 7-6 (7), 10-8 to the American brothers, who booked their third successive final berth in the US $ 2,615,000 event.
For 15 minutes Novak Djokovic appeared to have a fight on his hands at the ATP World Tour Finals on Wednesday, then the Serb dialled up his A game and tore Stanislas Wawrinka to pieces.
Rohan Bopanna and his Romanian partner Florin Mergea advanced to the semi-finals of the ATP Shanghai Rolex Masters with a shock victory over the fourth seeded Croat-Brazilian pair of Ivan Dodig and Marcelo Melo on Friday. The unseeded Indo-Romanian won the quarter-final 6-4, 3-6, 10-7.
The Indo-Czech duo lost to Bob and Mike Bryan in a thriller at the Tennis Masters Cup.
With this loss, Prajnesh lost a golden opportunity to face Djokovic in the second round.
Third seeds Rohan Bopanna and Florin Mergea progressed into the men's doubles semifinals.
Veteran Indian tennis star Leander Paes and his French partner Jeremy Chardy bowed out of the Delray Beach Open after going down to defending champions Bob and Mike Bryan in the men's doubles semi-final in Delray Beach on Saturday.
They have been drawn in Group Ashe-Smith along with John Peers/Jamie Murray and Simone Bolelli/Fabio Fognini.
The Indo-Czech pair beat the Bryan brothers Bob and Mike in the men's doubles quarter-finals at Wimbledon.
They were beaten by the Bryan twins, Bob and Mike, in the men's doubles at the French Open.
Break Point is an emotional ride into Indian tennis' ultimate fairytale gone wrong, observes Deepti Patwardhan.
Leander Paes and Radek Stepanek upset second seeds Daniel Nestor of Canada and Max Mirnyi of Belarus to win the Sony Ericsson Open in Miami on Saturday. The newly-formed Indo-Czech pair needed 82 minutes to prevail 3-6, 6-1, 10-8.
India's Rohan Bopanna and his Romanian partner Florin Mergea reached the semi-finals of the ATP World Tour Finals with a straight sets win at London's O2 Arena on Tuesday.
Leander Paes of India and his Czech partner Radek Stepanek stunned American pair of Bob and Mike Bryan to clinch the Australian Open men's doubles trophy.
Indian duo of Leander Paes and Mahesh Bhupathi stormed into the semi-finals of the ATP World Tour finals doubles competition after an easy straight-set victory over top seeds and three-time winners Bob and Mike Bryan, in London.
Indian tennis player Rohan Bopanna's Pakistani doubles partner Aisam-ul-Haq Qureshi says the pair will have to become mentally tougher to produce knockout performances that are required to win Grand Slams.
Rohan Bopanna and his Pakistani partner Aisam-ul-haq Qureshi eked out a hard earned win over Michael Mertinak of Slovakia and Dick Norman of Belgium to book a place in the quarter-finals of the Sony Ericsson Open.
World number eight Andy Roddick and 18th-ranked Sam Querrey will represent the United States in a first-round Davis Cup tie against Chile next month, captain Jim Courier said on Thursday.
India's Rohan Bopanna earned himself an opportunity to become only the fourth Indian to win a Grand Slam trophy by reaching the French Open mixed doubles final with partner Gabriela Dabrowski, in Paris.