Question: This pair of GP2 Series motor races supported a Formula One motor race won by what driver?

Context paragraphs:
2014 Red Bull Ring GP2 and GP3 Series rounds: The 2014 Austria GP2 Series round was a pair of motor races held on June 21 and 22, 2014 at the Red Bull Ring in Spielberg, Austria as part of the GP2 Series.  It is the fourth round of the 2014 season.  The race weekend supported the 2014 Austrian Grand Prix.

2016 Baku GP2 Series round: The 2016 Baku GP2 Series round was a pair of motor races held on 18 and 19 June 2016 at the Baku City Circuit in Azerbaijan as part of the GP2 Series.  It was the third round of the 2016 GP2 Series and was run in support of the 2016 European Grand Prix.  The first race, a 26-lap feature event, was won by Prema Racing driver Antonio Giovinazzi who started from pole position.  Sergey Sirotkin finished second for ART Grand Prix, and Russian Time driver Raffaele Marciello came in third.  Giovinazzi won the second event, a 21-lap sprint race, ahead of teammate Pierre Gasly in second and Sirotkin in third.

2015 Bahrain GP2 Series round: The 2015 Bahrain GP2 Series round was a pair of motor races held on 18 and 19 April 2015 at the Bahrain International Circuit in Sakhir, Bahrain as part of the GP2 Series.  It was the first round of the 2015 GP2 Series and was run in support of the 2015 Bahrain Grand Prix.  The first race, a 32-lap feature event, was won by ART Grand Prix driver Stoffel Vandoorne who started from the pole position.  Rio Haryanto finished second for the Campos Racing team, and Racing Engineering driver Alexander Rossi came third.  Haryanto won the second event, a 23-lap sprint race, ahead of Vandoorne in second, and Lazarus driver Nathanaël Berthon in third.

2014 Bahrain GP2 Series round: The 2014 Bahrain GP2 Series round was a pair of motor races held on 6 and 7 April 2014 at the Bahrain International Circuit in Sakhir, Bahrain as part of the GP2 Series.  It was the first round of the 2014 GP2 Series and was run in support of the 2014 Bahrain Grand Prix.  The first race, a 32-lap feature event, was won by ART Grand Prix driver Stoffel Vandoorne after starting from second position.  Julián Leal finished second for the Carlin team and DAMS driver Jolyon Palmer came in third.  Palmer won the second race, a 23-lap sprint event, ahead of Rapax driver Simon Trummer in second and Leal third.

2014 Austrian Grand Prix: The 2014 Austrian Grand Prix (formally the Formula 1 Grosser Preis Von Österreich 2014) was a Formula One motor race held on 22 June 2014 at the Red Bull Ring in Spielberg, Austria.  It was the eighth round of the 2014 season and the 28th Austrian Grand Prix and the first to be held since 2003.  The 71-lap race was won by Mercedes driver Nico Rosberg after starting from third position.  His teammate Lewis Hamilton finished second with Valtteri Bottas third for the Williams team.

2012 Marina Bay GP2 Series round: The 2012 Marina Bay GP2 Series round is a group of motor races that will be held at the Marina Bay Street Circuit in Marina Bay, Singapore for the GP2 Series championship, with the 2012 GP3 Series season having concluded at the previous round at Monza.  The races, which will be held on 22 and 23 July, will be in support of the Singapore Formula One Grand Prix, and represent the final round of the 2012 GP2 Series season.  The event marks the first time the GP2 Series has travelled to Singapore.

2011 Monza GP2 Series round: The 2011 Italian GP2 Series round was a GP2 Series motor race held on September 10 and 11, 2011 at Autodromo Nazionale Monza, Italy.  It was the ninth round of the 2011 GP2 season and the eighth round of the 2011 GP3 season.  The race supported the 2011 Italian Grand Prix.  This was the last championship round of the season for both series, but GP2 will race a non-championship round in Abu Dhabi.

2013 Monaco GP2 Series round: The 2013 Monaco GP2 Series round was a pair of motor races held on 24 and 25 May 2013 at the Circuit de Monaco, Monte Carlo, Monaco as part of the GP2 Series.  It was the fourth round of the 2013 GP2 Series and was run in support of the 2013 Monaco Grand Prix.  The first race, a 42-lap feature event, was won by Russian Time driver Sam Bird after starting from third position.  Kevin Ceccon finished second for the Trident Racing team and Arden International driver Mitch Evans came in third.  Stefano Coletti of the Rapax team won the second event, a 30-lap sprint race, ahead of MP Motorsport's Adrian Quaife-Hobbs in second and Evans third.

2005 Bahrain GP2 Series round: The 2005 Bahrain GP2 Series round was a GP2 Series motor race held on September 29 and 30, 2005 at the Bahrain International Circuit in Sakhir, Bahrain.  It was the final round of the 2005 GP2 Series season.  The race weekend was a stand-alone event unlike the previous GP2 rounds which support Formula One Grands Prix.

2012 Bahrain GP2 Series rounds: The 2012 Bahrain GP2 Series rounds were a series of GP2 Series motor races held at the Bahrain International Circuit as part of the 2012 GP2 Series season.  The first round was held on 21 and 22 April, in support of the 2012 Bahrain Grand Prix.  The second round was held one week later as an independent round of the championship, the only one of its kind on the 2012 calendar.

Supporting paragraphs: 2014 Red Bull Ring GP2 and GP3 Series rounds 2014 Austrian Grand Prix
Answer: Nico Rosberg