WASHINGTON -- Trailing in a tiebreaker against top-seeded John Isner, Steve Johnson managed to put a 146 mph serve into play and then decided to try something even more audacious: lob his 6-foot-10 opponent.Much to Johnsons surprise, the looping backhand worked, winning the point. Hanging in there against the big-serving Isner, Johnson weathered a total of 12 set points and withstood 29 aces to win their all-American quarterfinal at the Citi Open 7-6 (7), 7-6 (15) on Friday.Youre never too tall to lob. I thought he was going to close in really hard. And I just hit a good lob. I mean, thats about it, the fifth-seeded Johnson said about the point that came with Isner ahead 5-3 in the opening tiebreaker. I dont know if Ill ever try to lob him again and itll work, but luckily it worked today.Isners take?I love Stevie to death, he said, but I dont think that backhand lob he it -- I dont think he could do that all the time.Isner is a three-time runner-up at the hard-court tournament, including a year ago, when he beat Johnson in the semifinals. This time, Isner was unable to convert five set points in the opening frame and another seven in the second. When he lost the first tiebreaker on Johnsons forehand winner, Isner mangled his racket by slamming it to the court.The second tiebreaker was even longer and more excruciating for Isner. On his second set point, at 6-4, he got a good look at a short return by Johnson but shanked a forehand long.I dont think hell ever do that again, Johnson said. I dont know what happened.Heres how Isner explained it: I pulled up and got tentative.Not quite the longest tiebreaker of the season -- Isner lost one 18-16 last month -- it ended when he double-faulted for the only time in the nearly 2-hour contest to set up a sixth match point -- so lucky, Johnson said later -- then pushed a forehand wide.Johnson, ranked a career-best 25th, won despite never earning a break point against Isner. But Johnson saved all six break chances Isner accumulated and wound up with 22 aces himself.I certainly, in my opinion, put more pressure on him that he put on me, Isner said.Earlier Friday, sixth-seeded Jack Sock lost another two-tiebreaker match, beaten by 13th-seeded Ivo Karlovic of Croatia 7-6 (4), 7-6 (6).Karlovic hit 26 aces, saved all four break points he faced and reached the semifinals in Washington for the first time since 2007. Hell play Johnson on Saturday.The other semifinal will be second-seeded Gael Monfils against seventh-seeded Alexander Zverev. Monfils advanced by beating American Sam Querrey 6-4, 3-6, 6-1, while Zverev defeated No. 4 Benoit Paire 6-1, 6-3.In the womens quarterfinals, top-seeded Sam Stosur, the 2011 U.S. Open champion, was surprised by 173rd-ranked wild-card entry Jessica Pegula 7-6 (4), 6-3, No. 7 Yanina Wickmayer beat No. 4 Kristina Mladenovic 4-6, 6-3, 6-4, No. 6 Yulia Putintseva eliminated Risa Ozaki 6-4, 6-2, and Lauren Davis topped Camila Giorgi 6-4, 6-4.Sock had a chance to force a third set against Karlovic, holding a set point at 6-5 in the second tiebreaker. But Karlovic erased that with -- what else? -- a 133 mph ace, then delivered a 130 mph service winner to get to match point. He won when Socks forehand clipped the net tape and flew wide.I feel like I scrap pretty well and get a lot of returns back and I still cant break the guy, Sock said. No matter who he plays -- any round, any tournament -- it comes down to a point here and there.The 37-year-old Karlovic, a 6-foot-11 Croatian, is coming off a title on grass at Newport, Rhode Island, last week.He is the oldest man to win an ATP singles tournament since 1979.Asked what its like to enter events where he could potentially face a teenager -- Zverev, for example, is 19 -- Karlovic replied: Yeah, I mean, I could be their daddy.After a brief pause, he added: And, I mean, who knows? Maybe I am.Then he cracked a big smile, rocked back in his chair and said, No, no, Im joking.---Follow Howard Fendrich on Twitter at http://twitter.com/HowardFendrich Adidas Nmd Levně Damske . A forerunning sled crashed into the worker Thursday at the Sanki Sliding Center. The unidentified worker broke both legs and was airlifted to a nearby hospital. Yeezy Powerphase Cz . -- The Sacramento Kings are set to become the first major professional sports franchise to accept Bitcoin virtual currency for ticket and merchandise purchases. http://www.botynmdlevne.com/ . Francis told several hundred members of the European Olympic Committees that when sport "is considered only in economic terms and consequently for victory at every cost . Boty Nmd Levne . -- The Magic have their first victory of the new year. Adidas Nmd r1 Damske Levne . Tomas Berdych and Radek Stepanek defeated Nenad Zimonjic and Ilija Bozoljac 6-2, 6-4, 7-6 (4) on the indoor hard-court at Belgrade Arena. The victory improved the Czech pairs impressive cup doubles record to 14-1. CANTON, Ohio -- The Latest on the Pro Football Hall of Fame inductions (all times local):---3:45 p.m.Fans headed to Saturday nights Hall of Fame induction ceremony who also attended Friday nights Tim McGraw concert to kick off the weekend were still buzzing about the show.McGraw, a huge football fan, had Hall of Famers Jim Kelly and Mel Blount come on stage at the end of Something Like That. Blount even did a little singing, and Kelly called McGraw a Hall of Famer for one night.Several fans said they were impressed that the country stars opening song, How Bad Do You Want It? featured football videos behind the stage and around thhe stadium.ddddddddddddA Packers fan from Milwaukee, wearing a No. 4 Brett Favre jersey who identified himself only as Lou (no last name, please; I aint supposed to be here) said he especially enjoyed when McGraw changed a line in I Like It, I Love It. The lyric usually is: I aint seen the Braves play a game all year, but McGraw substituted Packers.Hey, Tim McGraw one night, Brett going into the Hall of Fame the next, Lou said. Thats heaven.---AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL ' ' '