The blue and papaya orange MCL34 car was unveiled by 34 team employees at the former champions' Woking headquarters before Sainz and 19-year-old British rookie team mate Lando Norris stepped up to admire it.
Renault's world champion Alonso finished second ahead of Ferrari's Michael Schumacher.
Alonso, who will make his McLaren debut after winning the Formula One championship for the past two years with Renault, had to make do with second place on the starting grid.
The Renault Formula One team will be renamed Alpine F1 from 2021, competing in French colours to showcase the carmaker's sportscar brand, new company CEO Luca de Meo announced on Sunday.
The Ferrari driver ended world champion Fernando Alonso's run of five successive poles.
With Sebastian Vettel's fourth successive Formula One title now just a formality, the more intriguing question is whether the Red Bull driver can go on to match a record that has stood for 60 years.
Goals from Dirk Kuyt and Xabi Alonso helped Liverpool secure a 2-0 home win.
Michael Schumacher is confident he can overtake Fernando Alonso with four races to go in the F1 season.
Key moments in Chelsea's Premier League title-winning season.
Twelve months ago Liverpool were ripping up the record books on the way to their first English top-flight title for 30 years but defeat by Everton on Saturday left them mulling a host of far less flattering statistics.
The Ferrari driver's main aim is to prevent Fernando Alonso from chalking up a fifth successive win.
Red Bull's Sebastian Vettel put himself on pole position for a fourth successive Formula One title after lapping the Indian Grand Prix circuit faster than any driver ever before on Saturday.
Lance Armstrong has been voted sports personality of the year, according to a poll published in the Spanish daily
McLaren: Raikkonen produced a brilliant race with a two-stop strategy.
Narain Karthikeyan finished 17th in Saturday's first qualifying for Sunday's Monaco Grand Prix.
Team by team analysis of Sunday's San Marino Formula One Grand Prix (listed in championship order).\n
Michael Schumacher won the San Marino Grand Prix for his and Ferrari's first victory of the F1 season
Liverpool boss Juergen Klopp has beaten Manchester United only twice in his career and never at Old Trafford -- his worst record against any Premier League side.
Costa, Alba excluded from Spain squad
De Jong is proud to join the likes of compatriots Ronald Koeman, Frank de Boer and Patrick Kluivert in heading to the Nou Camp, having dreamed of wearing Barca colours.
The racist chants took the shine off a great day for Chelsea who have tightened their grip on fourth place.
The pole was Hamilton's ninth in 10 races this season, the 47th of his career and left the Briton perfectly placed for a fifth career win at the Hungaroring.
Germany's Nico Rosberg gave Mercedes their third pole position in succession on Saturday with a front row lockout at the Spanish Formula One Grand Prix.
McLaren set the pace in Friday's Brazilian Grand Prix practice with Colombian Juan Pablo Montoya the fastest race driver.
Images from the English Premier League matches played on Saturday
Mercedes are expected to wrap up the constructors' championship on Sunday with three races to spare, having won 12 of the 15 so far with eight one-two finishes.
The Scot believes his former McLaren team mate Kimi Raikkonen could yet emerge as Formula One champion this season.\n
Ferrari are considering whether to lodge a protest that could lead to the result of the Formula One world championship being overturned.
Four times world champion Sebastian Vettel is leaving Red Bull at the end of the season and is set to join Ferrari, the Formula One team said on Saturday.
India's Narain Karthikeyan will start 19th on the grid on Sunday's Turkish Grand Prix.
Fernando Alonso feels Sunday's inaugural Turkish Grand Prix could play to Renault's strengths.
Germany's Nico Rosberg took Mercedes' second successive pole position in qualifying for the Bahrain Formula One Grand Prix on Saturday.
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