Fernando Alonso's retirement from the Canadian Grand Prix was the biggest nail yet in the coffin of McLaren's doomed relationship with Honda.
With the Spaniard running 10th and on course to claim the team's first point of the 2017 season at Circuit Gilles Villeneuve, an oil pressure issue two laps from the finish proved any optimism to be misplaced.
The partnership between the once-great McLaren team and Honda has taken a sizeable and undeniable step in the wrong direction this season.
After finishing ninth out of 10 in the constructors' standings in the first year of the deal in 2015, a more promising 2016 saw the team finish sixth.
However, Alonso has crossed the chequered flag in just one race so far this season, while team-mate Stoffel Vandoorne has managed three finishes in seven rounds.
Even Alonso's bid to escape the underperformance of his F1 car was haunted by its failings - the Honda he drove at the Indy 500 suffered engine failure 21 laps from the end.
A driver of Alonso's talent and popularity - highlighted by his venture into the stands after pulling up on Sunday - will have plenty of offers to move elsewhere and he has not ruled out a permanent switch to IndyCar as he grows increasingly frustrated.
McLaren executive director Zak Brown conceded to having "serious concerns" about the current state of affairs ahead of Sunday's race in Montreal and those worries will only have grown deeper over the weekend.
For a team who only five years ago were regularly winning grands prix, the level of disappointment at missing out on a single point is a stark indicator of just how grave the situation has become at McLaren.
"We dared to hope", said racing director Eric Boullier after the race, speaking as if his team were chasing silverware, not scraps.
"OK, what we were daring to hope for were hardly rich pickings: a solitary world championship point for Fernando, who had driven superbly all afternoon, as he's driven superbly every race-day afternoon for the past two-and-a-half years.
"But, after so much toil and heartache, even that single point would have felt like a victory.
"And then came yet another gut-wrenching failure.
"It's difficult to find the right words to express our disappointment, our frustration and, yes, our sadness. So I'll say only this: it's simply, and absolutely, not good enough."
McLaren are considering their options regarding engine suppliers for the 2018 season, and a return to Mercedes power is thought to be under consideration.
Whatever the way forward, Honda's chances of being retained are diminishing with every passing race.
|Azarenka granted wildcard for Australian Open|
|Root urges England to stand up and put things right|
|Man City haven´t won anything yet – Gundogan|
|Pierre leads Dinamo Sassari past Pinar Karsiyaka|
|Willian: Chelsea will keep fighting for Premier League title|
|Burnley aren´t the real deal – Dyche|
|Stoger wants to bring best out of BVB after breakthrough victory|
|Conte praises contribution of Hazard, Willian and Pedro|
|Inter 0 Pordenone 0 (AET, 5-4 on penalties): Nagatomo spares Serie A leaders´ blushes|
|Hodgson keeping Palace grounded despite dramatic late win|
|Zouma injury led to Turf Moor defeat – Hughes|
|Guardiola steers carefully around Mourinho criticism after United v City flashpoint|
|Guardiola considering January signings to bolster Manchester City squad|
|Get me in the mix – Ricciardo wants to join Vettel, Hamilton rivalry|
|Crystal Palace 2 Watford 1: Sako, McArthur stun Hornets|
|Huddersfield Town 1 Chelsea 3: Willian sparkles as Conte´s side return to winning ways|
|Burnley 1 Stoke City 0: Hosts go fourth after late Barnes winner|
|PSG escape punishment as LFP gives Lille transfer ban|
|Mainz 0 Borussia Dortmund 2: Stoger´s tenure begins with much-needed victory|
|Need to wrap a golf club for Christmas? Don´t ask Dustin Johnson for help|
|Ten Cate: Al Jazira will park three buses against Real Madrid|
|Gremio 1 Pachuca 0 (after extra time): Everton stunner sends Brazilians into final|
|Zidane focused on Club World Cup despite looming Clasico|
|Ibrahimovic brands Guardiola ´immature´ over Barcelona row|
|Gayle´s 18 sixes a new T20 record|
|Pogba has no regrets over rejecting Real Madrid|
|Gattuso denies contract rift with AC Milan goalkeeper Donnarumma|
|Where you at? Cleared Fury calls out Joshua|
|Pochettino: Alderweireld out until February|
|Wydad Casablanca 2 Urawa Red Diamonds 3: Marvellous Mauricio double proves decisive|
|Cardona given five-match ban for ´discriminatory´ gesture against South Korea|
|Fury clears comeback hurdle as UKAD proceedings resolved|
|Knee injury rules Wales´ Faletau out of Six Nations|
|James still settling at Bayern, says Heynckes|
|Pistorius bruised in alleged prison assault|
|Manchester City captain Kompany out for ´a short time´|
|Klopp: Liverpool need Lallana ahead of busy period|
|Spurs list Leonard as probable for season debut|
|It was diversity in education – Mourinho addresses derby fracas|
|I encourage City to celebrate - Guardiola defends players after Old Trafford controversy|
|I´m no actor – No regrets for Klopp over heated interview|
|Anderson: Duckett incident a non-event|
|Shingler commits to Scarlets|
|Everton were like United at Liverpool - Allardyce defends Anfield approach|
|Paulo Bento hired as Chongqing Lifan head coach|
|Wolfpack and Toulouse to make Magic Weekend history|
|Ramsey hamstring injury ´not a big one´|
|Watford´s Zeegelaar gets three-match ban as appeal is rejected|
|Struggling Northampton sack Mallinder|
|Matthaus raves about Spurs star Kane|
|Cook: England must improve damaged reputation|
|´Several clubs´ discussing Arda move as Barca exit nears|
|No ultimatum as Arsenal´s Ozil and Sanchez talks rumble on|
|Su-Mourinho? Wenger offers advice to City and United|
|Bayern planning ´serious talks´ with Robben, Ribery|
|Titans lure Roosters veteran Gordon|
|Hazlewood welcomes Johnson advice and eyes Root scalp|
|Pereira replaces Villas-Boas at Shanghai SIPG|
|Van Gaal rejected Leverkusen to hold out for a ´big club´|
|Cook dismisses retirement talk heading into 150th Test|
|Williamson lauds record-equalling Taylor as Kiwis celebrate series win|
|Dolphins stun Brady and Patriots|
|Inzaghi and Lazio left feeling ´defrauded´ after Torino defeat|
|Marsh confident and ready to heap misery on England|
|New Zealand sweep Windies with 240-run victory|
|Man United more boring under Mourinho, claims Van Gaal|
|Rodgers return a medical decision for Packers|
|Stanton rips ´unprofessional´ and ´circus times´ with Marlins|
|Zidane: Real Madrid want to win Club World Cup|
|Worker to open batting as Guptill misses ODI series|