Alexander Zverev felt a patient approach paid off against John Isner as he made sure not to miss out on the knockout stages of the ATP Finals for a second successive year.
German Zverev failed to qualify for the semi-finals in 2017 after losing his final group match, going down in a three-set thriller against Jack Sock at the O2.
However, the world number five made sure history was not repeated when facing another American opponent this year, recording a 7-6 (7-5) 6-3 triumph over John Isner to set up a clash with Roger Federer on Saturday.
In a tightly fought contest, the 21-year-old from Hamburg recorded the only break against the big-serving Isner, who bowed out of the season-ending tournament with a third straight defeat.
"Against John, you have to be patient. There are going to be a lot of games where you really don't touch the ball on his serve," Zverev told Sky Sports.
"That's what happened for one and a half sets basically, so you've really got to take your chances when you get them.
"I did that well today and I'm very happy to be through to get another chance to play tomorrow."
Zverev admitted the memories of losing to Sock at the same venue a year earlier had motivated him ahead of his final outing in Group Guga Kuerten.
"I was in the same position last year against Jack Sock and missed my opportunity to go through," he added.
"I really wanted to do it differently this year, I really wanted to come out and be aggressive, play the best game I can and give myself the best possible chance to be in the semi-finals."
In the other last-four clash, top seed Novak Djokovic will take on Kevin Anderson of South Africa.
18 de febrero 2019
|Henderson targets Premier League and Champions League double|
|Hogg ruled out as Townsend adds six to Scotland squad|
|Cancellara backs Cavendish to claim more stage wins|
|Tyson Fury agrees lucrative deal to be co-promoted by Top Rank|
|Leeds United suffer blow with Roofe injury|
|Klopp fears Bayern Munich are ´more dangerous than before´|
|Rosberg: Hamilton favourite again and pressure on Vettel|
|Klopp assessing Lovren ´minute by minute´ ahead of Bayern|
|Paratici confirms Juventus enquiry over Icardi|
|I am still contracted to my team - Savea responds to Toulon owner´s bizarre outburst|
|Carter sad for retiring Lambie but excited to make Racing return|
|Harvey to step down as EFL CEO|
|IAAF calls on five experts as Semenya challenges hyperandrogenism rule via CAS|
|Shaqiri has silenced doubters at Liverpool, says Barnetta|
|I´ll try to keep racking them up - Durant wants more after All-Star MVP|
|Coman back but no Boateng for Bayern Munich´s trip to Liverpool|
|Kaepernick may not want to return to the NFL - Allen|
|Foden dwelling on one mistake over decisive Newport double|
|LeBron focusing on Lakers´ playoff push after All-Star Game|
|Liverpool are favourites against Bayern Munich - Kimmich|
|Squire leaving New Zealand to join Red Hurricanes|
|Liverpool v Bayern Munich: James desperately needs a career boost at Anfield|
|Clash with ultras, stripped of captaincy - a timeline of Icardi´s fractured Inter relationship|
|Ospina will remain at Napoli next season, says Ancelotti|
|Antetokounmpo shines, Nowitzki and Wade can still play – takeaways from NBA All-Star Game|
|Top highlights from Team LeBron´s victory over Team Giannis in NBA All-Star Game|
|Durant earns All-Star Game MVP honours|
|Team LeBron rally past Team Giannis|
|PSG can reach Champions League final without Neymar – Cafu|
|Holmes edges out Thomas to win fifth PGA Tour event|
|Hamlin wins crash-filled Daytona 500|
|Marotta: Inter have never doubted Icardi|
|Guardiola was questioned too – Zola says Sarri needs time|
|Icardi has no intention to leave Inter - Nara|
|Tuchel hails ´exceptional´ PSG mentality|
|Mbappe: PSG team better than my goals record|
|Opelka claims maiden ATP title in New York|
|Mbappe makes Ligue 1 history with wonderful volley|
|Saudi takeover of Manchester United dismissed|
17 de febrero 2019
|Stroman unhappy with Blue Jays´ lack of veteran leadership|
|Sanchez is far from finished at the top level, insists Solskjaer|
|Giggs: Give Man United job to Solskjaer|
|Robinson hails Morris´ ´special´ Roosters debut|
|Saint-Etienne 0 Paris Saint-Germain 1: Magical Mbappe snatches the points|
|Morris: I showed Roosters team-mates what I can do|
|Morris´ debut hat-trick guides Roosters to World Club Challenge glory|
|Icardi did not celebrate Inter win in dressing room, says Spalletti|
|Can: No privileges at Juventus, even for Ronaldo|
|Crusaders coach Robertson signs on for two more seasons|
|20-0 farce slammed as ´insult to sport´ by Italian football chief|
|Messi makes playing for Barcelona easier - Dembele|
|Alisson: Liverpool won´t feel Van Dijk loss against Bayern|
|SPAL coach Semplici left frustrated by VAR controversy|
|Jose Mourinho open to Ligue 1 job|
|Inter 2 Sampdoria 1: Nainggolan salvages win in Icardi´s absence|
|Muguruza and Kasatkina battle their way into Dubai second round|
|Cecchinato hammers home favourite Schwartzman to win Argentina Open|
|Toulouse resist Racing fightback to reclaim top spot|
|Icardi contract talks continue despite losing Inter captaincy|
|Halep ends Van Cleemput collaboration|
|Swansea City 4 Brentford 1: James-inspired turnaround books quarter-final berth|
|Doncaster Rovers 0 Crystal Palace 2: Eagles ease into FA Cup´s last eight|
|Windies star Gayle to retire from ODIs after World Cup|
|Wenger backs Henry to bounce back|
|20-0! Seven-man crisis club Pro Piacenza thrashed in Serie C farce|
|Monfils holds off Wawrinka for Rotterdam title|
|Walker hat-trick gets Rhinos up and running|
|Ramos red card an ´occupational hazard´, says Solari|
|Dan Carter to make Racing 92 return|
|Ashton ruled out for Wales clash|