ZAGREB, Croatia -- In a battle of big servers, Argentinas Juan Martin Del Potro beat Croatias Ivo Karlovic 6-4, 6-7 (6), 6-3, 7-5 on Friday to leave the two teams tied at 1-1 following the opening singles matches in the Davis Cup final.Del Potro, the 2009 U.S. Open champion who is capping a comeback after two injury-hit years, made the crucial break in the 11th game of the fourth set.Karlovic, who at 37 became the oldest man to play singles in a Davis Cup final in nearly a century, served 35 aces while Del Potro had 15.Doubles are played Saturday while reverse singles are scheduled for Sunday.Argentina is the only nation in the Davis Cups 116-year history to have reached four finals without winning the title. Croatia is targeting its second title after beating Slovakia in the final in 2005.Croatia won the opening singles rubber after Marin Cilic struggled past Argentinas Federico Delbonis 6-3, 7-5, 3-6, 1-6, 6-2.Cilic, the 2014 U.S. Open champion, looked like he was cruising to the expected easy victory until Delbonis broke him twice in the third set, which ended on a Cilic double fault.I struggled on my return, said Cilic, the highest-ranked player in the final at No. 6. His [high] toss on his serve is a bit specific and it gave me problems.I never said the match would be easy. After all, this is the final, Cilic said.Delbonis started the fourth set 3-0 with a double break, and Cilic conceded the set on serve by netting an easy smash.But after a bathroom break, Cilic came back renewed and broke Delbonis to start the fifth set on the indoor hard court at Arena Zagreb. Cilic suddenly rediscovered his serving groove, and didnt give Delbonis a chance.I took a short break, talked to the coach, Cilic said. I was determined to start playing better.Cilic broke again in the seventh game, and served out after 3? hours, two hours longer than most expected.Cilic served 17 aces in the match watched by some 12,000 fans, including thousands of Argentinians who outshouted the home supporters. Among them was former Argentine soccer star Diego Maradona.His serve was the key, Delbonis said. In the first two sets, he was serving unbelievably. When I started making some returns, things changed. Fake Air Max 97 For Sale . But now that hes in the NHL, the Calgary Flames centre showed big improvement in that department by scoring the winner in the eighth round of a 5-4 shootout victory over the Winnipeg Jets on Monday. Fake Air Max 270 For Sale . Q: Team Canada announces their Olympic roster three weeks from today. Who is general manager Steve Yzerman watching? LeBrun: Over the last 48 hours, hes taken in the home-and-home between the Dallas Stars and Colorado Avalanche with Jamie Benn and Matt Duchene being the obvious targets. http://www.fakeairmaxukoutlet.com/best-max-90-trainers-cheap-uk.html . -- Derrick Rose shook off poor shooting early to hit clutch shots late and Carlos Boozer had 20 points and 13 rebounds to lead the Chicago Bulls to a 104-95 preseason victory over the Oklahoma City Thunder on Wednesday night. Cheap Nike Tn Trainers Uk . Murray beat Sam Querrey 7-6 (5), 6-7 (3), 6-1, 6-3 to clinch Britains opening-round victory against the United States on Sunday at Petco Park. "Im proud of the way Im playing just now, because I had to do a lot of work to get back to where I want to be," Murray said after celebrating with his teammates on the red clay court in a temporary stadium in left field of the downtown home of baseballs San Diego Padres. Air Max Outlet Uk .5 seconds to play in the game, Kevin Love never stopped believing that they would come out of there with a win. The Boston Celtics finally landed the kind of star theyve been trying to acquire: Al Horford.?So, after surprising the league by winning 48 games last season, how good is Boston now? ' ' '