Defending champion Roger Federer overcame a second-set stumble and saved two match points before defeating Benoit Paire to reach the Gerry Weber Open quarter-finals.
The world number one, needing to retain this title to keep his place in the rankings, was worked hard but emerged a 6-3 3-6 7-6 (9-7) winner to remain unbeaten since his return to action for the grass-court season.
Paire matched Federer comfortably early on, but his frustration was evident when he missed an opportunity to break into the lead, allowing the top seed to take control.
If the Frenchman had gifted his opponent the advantage, he ensured the remainder of the match was less straightforward, yet Federer's resolve told and a 10th title in Halle is still on the cards.
Following a steady start, Federer was forced to save the first break point after he failed to make contact with a volley from Paire's measured lob.
But the Swiss ruthlessly closed that opening and then edged in front, profiting as Paire found the net and then smashed his racquet into the grass as his rage built.
Federer took the set and was straight onto the front foot in the second, but he squandered a couple of early break points and Paire made a gain of his own in a dominant next game.
The top seed was now labouring through his service games and was broken again with ease, preventing a bagel with a swift momentum-slowing response but unable to wrest back the set.
It seemed as though Federer might find a second wind, as is so often the case, yet two match points were passed up en route to a tie-break.
Mini-breaks were soon traded under a closing roof until finally, after rescuing a pair of match points, Federer closed out victory when Paire sent a return long.
|Payton on Rams CB Peters: I have great respect for him|
|Rockets star Harden matches Chamberlain with historic performances|
|Nishikori survives Karlovic test in Melbourne|
|Vieira reunion felt really weird - Henry|
|´#BetAgainstUs´ - Edelman and Pats embracing underdog status|
|Van der Vaart: Isco the best player in the world|
|I haven´t seen Guardiola or Klopp do that – Lampard unhappy with Bielsa|
|Real Madrid always play to win, insists Casemiro|
|Royals pitcher Skoglund suspended for 80 games after testing positive for PEDs|
|Ronaldo and Juve celebrate Supercoppa Italiana title with Mayweather|
|We are not going to talk about Morata - Simeone reluctant to discuss striker|
|Madrid weak in Leganes loss, says Solari|
|Bologna and Banvit seal Champions League play-off spots|
|LeBron James to miss Thunder & Rockets games but nearing practice return|
|Leganes 1 Real Madrid 0 (1-3 agg): Isco starts as Solari´s side go through despite defeat|
|NFL playoffs 2019: X-factor for each NFC team|
|Mahomes: Chiefs must not repeat mistakes against Patriots|
|Higuain´s Supercoppa benching due to virus, says Milan boss Gattuso|
|Brown fires back at Arians over ´diva´ comments|
|Stone heading home from West Indies tour with back injury|
|Shazier will continue rehab with intention of playing again|
|That´s why we signed him! Allegri hails Supercoppa match-winner Ronaldo|
|Monaco on worst home run in club´s history after Nice draw|
|Atletico Madrid 3 Girona 3 (4-4 agg): Simeone´s side out on away goals|
|Gregg Williams is Jets´ new defensive coordinator|
|Ronaldo: Supercoppa triumph just the start for Juve|
|Monaco confirm Batshuayi talks|
|You know more than me! Bielsa´s Barcelona research surprised Guardiola|
|Juventus 1 AC Milan 0: Ronaldo heads Bianconeri to Supercoppa glory|
|Kane injury cannot be excuse for Tottenham – Pochettino|
|Woods to open 2019 schedule at Torrey Pines|
|Reported Liverpool target Dabbur to undergo Sevilla medical|
|Lebanon v North Korea: Radulovic calls on players to make history|
|MLS MVP Martinez signs five-year contract with Atlanta|
|WBC set deadline for Wilder-Fury rematch|
|Iran 0 Iraq 0: Team Melli top Group D after dull draw|
|Vietnam 2 Yemen 0: Quang Hai shines to give Golden Dragons hope|
|Bielsa admits to spying on all Leeds´ opponents|
|Valverde open to arrivals amid De Jong tug-of-war|
|Sexton named in Ireland squad for Six Nations openers|
|Higuain benched for Supercoppa Italiana amid Chelsea links|
|De Grandhomme, Latham and Santner back in Black Caps squad|
|Oman v Turkmenistan: Verbeek tells players to ´score as many as possible´|
|Japan v Uzbekistan: Cuper not distracted by potential last-16 opponents|
|Brown desperate for England recall|
|Lowry ties course record in Abu Dhabi|
|James is playing for Bayern future – Kovac|
|Wizards can compete for playoffs in LeBron-less East despite injuries - Brooks|
|Kyrgyzstan 3 Philippines 1: Lux hat-trick gives White Falcons third-place hope|
|South Korea 2 China 0: Son sets the standard as Bento´s men take top spot|
|Saudi Arabia v Qatar: Top spot on the line in Group E|
|Wasps pull off Fekitoa coup|
|Fresh injury woe for Real Madrid defender Vallejo|
|Home sweet home for Wozniacki as Stephens conquers Melbourne demons|
|Nadal: Victory over Ebden a step forward|
|Proteas rest Steyn and De Kock for opening ODIs|
|Nadal and Federer march on as rising stars prosper|
|Barcelona president Bartomeu convinced Valverde will stay|
|Inter forward Keita suffers thigh injury|
|Nadal races into third round with easy Ebden win|
|Kimmich ´perfect´ for Barcelona, says Xavi|
|Richardson and Nabi inspire Renegades´ rout of Sixers|
|This Liverpool isn´t a team of chokers – Mane|
|Central Coast Mariners 2 Melbourne City 1: Late Simon winner ends 10-match losing streak|
|Bryan backs Murray to return after hip resurfacing surgery|
|Scotland coach Townsend turns to trio of uncapped hookers|
|Spurs´ Aurier arrested on suspicion of assault, released without charge|
|That was a fireworks show - Warriors revel in record-breaking first quarter|
|We are in talks with Chelsea – Salihamidzic reiterates interest in Hudson-Odoi|
|´Proud´ Messi recognises impact of team-mates after reaching 400 LaLiga goals|