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. Shelby Miller Jersey .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.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.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. Brad Boxberger Jersey .Y. - Nelson Mandela will be honoured by the New York Yankees with a plaque in Monument Park. A. J. Pollock Diamondbacks Jersey . Mats Zuccarello and Derek Stepan scored shootout goals, and backup goalie Cam Talbot earned his second win in two nights as the Rangers shook off a late tying tally and beat the Maple Leafs 2-1 Monday night. http:///...s-alex-avila-jersey/ . In Europe, top teams seem to be largely happy with their squads after spending nearly $1 billion in the off-season. And although English league clubs are unlikely to splash cash in January, Arsenal and Chelsea could be tempted to strengthen their squads with new strikers.Manu Tuilagi has been included in Englands matchday squad for their Six Nations clash with Wales on Saturday. Leicester centre Tuilagi could bring to an end his injury-enforced 20-month international absence if he comes off the bench at Twickenham.Tigers director of rugby Richard Cockerill has voiced concerns that Tuilagi, who has struggled with groin and hamstring problems, is not ready for a return to the international stage. But England head coach Eddie Jones disagrees and has included him in his squad, with Alex Goode the man to make way.Wasps back Elliot Daly is retained for the penultimate round of the competition, while his club team-mate Joe Launchbury returns after sitting out the 21-10 win over Ireland with a hamstring injury. England head coach Eddie Jones has included Tuilagi in his matchday squad Northampton prop Kieran Brookes comes in to replace fellow Saints player Paul Hill in the 24, while Luke Cowan-Dickie of Exeter remains with the squad as cover for Jamie George at hooker.Jamie George sustained an injury to his arm during this afternoons [Tuesdays] training so Luke Cowan-Dickie remains with the squad as cover while Jamie undergoes further medical assessments, said England head coach Eddie Jones.  Warren Gatland says it was an easy decision to pick the same team for Wales clash against England England remain on course for the Grand Slam, having won their opening three matches against Scotland, Italy and Ireland. Curt Schilling Diamondbacks Jersey. NGLAND SQUAD:Forwards: Kieran Brookes, Dan Cole, Luke Cowan-Dickie, Jack Clifford, Jamie George, Dylan Hartley, James Haskell, Maro Itoje, George Kruis, Joe Launchbury, Joe Marler, Chris Robshaw, Billy Vunipola, Mako VunipolaBacks: Mike Brown, Danny Care, Elliot Daly, Owen Farrell, George Ford, Jonathan Joseph, Jack Nowell, Manu Tuilagi, Anthony Watson, Ben Youngs Eddie Jones names his England team to play Wales on Thursday. Watch Sky Sports News HQ from 10am to see the announcement. 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