Mikhail Youzhny was the defending champion, but lost in the first round to Janko Tipsarević.
Janko Tipsarević (, ] ; born 22 June 1984) is a Serbian professional tennis player.
 His career-high singles ranking is world No. 8, achieved on 2 April 2012.
 In his career, he has won four ATP World Tour titles, one ATP doubles title, three Futures, and 15 Challenger titles.
 Tipsarević also won the 2001 Australian Open Junior title.
 Tipsarević has achieved two victories over a World No. 1 player, having defeated compatriot Novak Djokovic twice.
 He also has thirteen victories against other players in the top 10: four wins against Tomáš Berdych, and one each against Fernando González, Mikhail Youzhny, David Ferrer, James Blake, Gaël Monfils, Andy Murray and Juan Mónaco.
 He holds victories over former World No. 1 players Carlos Moyá, Marat Safin, Lleyton Hewitt, Juan Carlos Ferrero and Andy Roddick.
 His best results at a Grand Slam have been reaching the quarterfinals at the US Open in 2011 and 2012.
 He is only the second Serb to reach the final 16 at all four different grand slams.
Janko Tipsarević and Dušan Vemić were the defending champions; however, they lost to František Čermák and Michal Mertiňák in the first round.
The 2011 Malaysian Open (also known as the '2011 Proton Malaysian Open' for sponsorship reasons) was a tennis tournament played on indoor hard courts.
 It was the third edition of the Proton Malaysian Open, and was classified as an ATP World Tour 250 Series of the 2011 ATP World Tour.
 It took place at the Bukit Jalil Sports Complex in Kuala Lumpur, Malaysia.
 Janko Tipsarević won the singles title.
Juan Mónaco (] ; born 29 March 1984), nicknamed "Pico", is a male former tennis player from Argentina.
 He won nine singles titles, reached the semifinals of the 2010 Shanghai Masters and the 2012 Miami Masters, and achieved a career-high singles ranking of world no. 10 in July 2012.
 He announced his retirement from professional tennis on 15th May, 2017.
The 2012 Aircel Chennai Open was a 2012 ATP World Tour tennis tournament, played on outdoor hard courts.
 It was the 17th edition of the only ATP tournament taking place in India and took place at the SDAT Tennis Stadium in Chennai, India.
 It was held from 2 to 8 January.
 Stanislas Wawrinka was the defending singles champion coming into the tournament but was knocked out in the quarterfinals.
 Former champion Marin Čilić was originally in the field as the 4th seed before pulling out with a patellar tendon injury.
 Finally, fourth seed Milos Raonic from Canada defeated world no. 9 and top seeded Serb Janko Tipsarević to win only his second ATP title.
 Raonic became the first player since Roger Federer in 2008 to win an ATP title without losing a serve.
 The doubles title went to the Indo-Serb pair of Leander Paes and Janko Tipsarević after they defeated the Israeli pair of Jonathan Erlich and Andy Ram.
Viktor Troicki was the defending champion, but his compatriot Janko Tipsarević defeated him in the first all-Serbian final in tennis history 6–4, 6–2.
Novak Djokovic was the defending champion, but lost to Janko Tipsarević in the quarterfinals.
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Igor Kunitsyn was the defending champion, but lost to Evgeny Korolev in the first round.
Mikhail Youzhny won in the final 6–7, 6–0, 6–4 against Janko Tipsarević.
Michaël Llodra (] ; born 18 May 1980) is a French former professional tennis player.
 He is a successful doubles player with three Grand Slam championships and an Olympic silver medal, and has also had success in singles, winning five career titles and gaining victories over Novak Djokovic, Juan Martín del Potro, Tomáš Berdych, Robin Söderling, Jo-Wilfried Tsonga, Nikolay Davydenko, Janko Tipsarević and John Isner.
 Llodra has been called "the best volleyer on tour".

Question: What is the nickname of the Argentinian tennis player who once lost to Janko Tipsarević?
Answer: Pico