Juan Martin del Potro saved three championship points as he stunned world number one and defending champion Roger Federer 6-4 6-7 (8-10) 7-6 (7-2) in an absorbing Indian Wells Masters final.
Del Potro was down 5-4 and a match point in the final set against 20-time grand slam champion Federer, who was on the cusp of a record sixth title at Indian Wells.
However, big-hitting Del Potro – who beat Federer in the 2009 US Open final – emerged from the jaws of defeat to snap the Swiss' 17-match winning streak to open the season.
The thrilling victory – lasting almost three hours – secured a maiden Masters 1000 title for world number eight Del Potro and just his seventh win in 25 attempts against Federer.
Federer was chasing his 28th Masters 1000 crown and 98th ATP title overall but he was upstaged by Del Potro early, the Argentine star losing just six points on serve in the opening set.
Del Potro struck the first blow, a second loose Federer forehand of the fifth game crashing into the net to leave the favourite a break down at 3-2.
The steely Argentine did not allow Federer a look-in in the first set, maintaining his advantage courtesy of such a potent forehand and powerful serve.
Federer did not have a single break point opportunity in a first set which Del Potro won when his opponent sent a forehand wide.
The crowd were off their seats when Federer produced a brilliant winner at full stretch in the first game of the second set and rose again when he won an epic rally which Del Potro kept alive with a between-the-legs shot from the baseline.
Federer made another uncharacteristic error by slapping a simple forehand in the net to make it 3-3 and he was left frustrated when a defiant Del Potro saved two set points at 5-4.
Del Potro managed to force a tie-break but he was no match for Federer, who outlasted his powerful opponent to finally force a decider.
There was more drama in the final set as Del Potro prevented Federer from claiming the title at 5-4, his brute power unnerving the 36-year-old, whose frustration was apparent.
And Federer cut a forlorn figure in the eventual tie-break, which Del Potro won at a canter to become the first player from Argentina to reign supreme at Indian Wells.
|Kings XI hold on for dramatic victory against Daredevils|
|´Shameful´ Bolivian side forfeit match at 7-0 down after fielding youth team|
|Henderson fired up for ´fantastic´ De Rossi battle|
|Klopp urges Liverpool fans to ´show respect´ to Roma|
|Juventus confirm muscle tear for Chiellini|
|Klopp key to surprising Salah success – Totti|
|Hartley to miss South Africa tour with concussion|
|Salah´s PFA award made more special by De Bruyne form – Klopp|
|Liverpool have earned the right to be feared, says Gerrard|
|Arsenal confirm ankle ligament damage for Elneny|
|Cubs´ Kris Bryant ´as good as can be expected´ after being hit with 96 mph fastball|
|Hector pledges future to struggling Cologne|
|´Crazy´ fans can help Roma knock out Liverpool, says Voller|
|Sharapova not short on desire despite struggles|
|South Africa to test unbeaten home record vs Pakistan & Sri Lanka|
|Kerr: Ginobili should keep playing another two years|
|He keeps getting better and better - Henderson full of praise for PFA winner Salah|
|Roma v Liverpool: Giallorossi have chance to write positive headlines|
|Prove you are the best - Povetkin promoter lays down Joshua gauntlet|
|Wenger will not be short of offers from clubs - Dein|
|LeBron hails Korver & Clarkson as Cavs square series|
|I may play the kids in the FA Cup next season, reveals bemused Pochettino|
|Simeone weighing up three-man defence for Arsenal tie|
|Kings wait for Bogut signing approval|
|Vieira refuses to address Arsenal rumours and Wenger departure|
|Cueto lowers historic ERA in Giants´ win|
|Spurs avoid sweep, Cavs edge Pacers|
|WATCH: Smith beats first-quarter buzzer with near full-court shot|
|Harden, D´Antoni hope Rockets regain top form|
|Man United star Pogba can win Ballon d´Or, says Ronaldinho|
|Silva loves me more than his girlfriend – Mendy|
|MLS Review: Timbers end NYC´s unbeaten start, Sounders claim first win|
|Flyers´ Couturier played with torn MCL|
|Emery praises PSG for maintaining motivation|
|Cavs´ Hill out for game four with back spasms|
|Oblak unsure over Atletico Madrid future|
|Klopp ready for ´different´ Roma test|
|Salah always determined to prove his Premier League worth|
|Landry earns first PGA Tour victory at Texas Open|
|City´s Sane named PFA Young Player of the Year|
|Salah pips De Bruyne to PFA Players´ Player of the Year award|
|Napoli bus spat at and insulted, Sarri claims|
|Navas will be at Real Madrid for many years – Perez|
|Juve still have the advantage, Allegri claims|
|Racing coach Labit ready for ´formidable´ Leinster challenge|
|Smalling not giving up on World Cup|
|Hard to catch Man City if they invest, Mourinho warns|
|Pogba: I have no problem with Mourinho|
|Koulibaly: Napoli have always believed in Scudetto|
|Bordeaux 0 Paris Saint-Germain 1: Lo Celso keeps champions on track for records|
|Atletico Madrid 0 Real Betis 0: More concerns for Simeone ahead of Europa League|
|Juventus 0 Napoli 1: Partenopei close the gap thanks to Koulibaly|
|Dominant Marquez maintains perfect record in Austin|
|Guardiola has no problem with Manchester City pitch invasion|
|Neymar must join Real Madrid to become the best - Rivaldo|
|There was no player better than De Bruyne - Guardiola backs City man for PFA award|
|Top managers should want Arsenal job, says Moyes|
|Manchester City boss Guardiola aiming to smash records following title triumph|
|Las Palmas relegated from LaLiga after 4-0 home defeat to Alaves|
|Archer and Gowtham combine for dramatic Royals victory|
|This won´t happen forever - dominant Nadal reflects on latest success|
|Andrew Bogut returns to Australia, signs with Sydney Kings|
|Manchester City break Premier League passing and possession records|
|Conte: Morata still important despite Giroud impact|
|Inter gave up against Chievo, admits Spalletti|
|Conte denies Mourinho rift ahead of FA Cup final|
|Levy claims fifth European Tour crown in Rabat|
|Diouf miss ´a turning point´ for both Stoke and Burnley|
|Hughes upset with lack of VAR after Southampton´s FA Cup loss|
|Manchester City 5 Swansea City 0: Guardiola´s champions turn on the style|