lost to Australian Bernard Tomic in the second round. At the 2012 US Open, he matched his best US Open and Grand Slam performance from before his injuries, reaching the second round. He defeated Jan Hájek before falling to eighth seed Janko Tipsarević. During the indoor hard-court season, Baker qualified (as the top qualifying seed) for the ATP 500 tournament Beijing, losing in the first round to Kevin Anderson. He then qualified for the Shanghai Masters, losing to 11th seed Richard Gasquet in the opening round. After these consecutive first-round losses, Baker pulled off a remarkable comeback by winning against Radek Štěpánek in Basel, after being a set and a double-break down. Baker lost in the second round to eventual champion Juan Martín del Potro. He ended 2012 ranked world No. 61, after reaching a career-high ranking of world No. 52 in October. 2013 In the Heineken Open in Auckland, Baker upset fifth seed (and recent Paris Masters finalist) Jerzy Janowicz in the first round. He converted 2 out of 17 break points and finally won on his eighth match point. In the second round of the Australian Open, Baker led 20th seed Sam Querrey 7–6(2), 1–1 before a knee injury forced him to retire. This was later diagnosed as a torn meniscus, which put Baker off the tour for about four months. Baker made his return in Aptos. losing to Guido Pella. He then lost to Grigor Dimitrov in the second round of the Cincinnati Masters. At the U.S Open. he was defeated by Lleyton Hewitt in the first round. He ended 2013 ranked world No. 359. 2014 Baker withdrew from the 2014 Australian Open, citing a knee injury. 2015–2017 He was granted a wild card into the main draw of the 2016 Australian Open after a nearly three-year injury layoff. In August 2016, he lost in the Round of 16 of the Tennis at the 2016 Summer Olympics – Men's doubles partnering with Rajeev Ram. They faced off against the Austrian team of Oliver Marach and Alexander Peya. In February 2017, he won his maiden ATP Tour title at the Memphis Open in doubles partnering Nikola Mektić. They faced off against compatriots Ryan Harrison and Steve Johnson in the final. He won his second doubles title in Budapest in April, again partnering with Mektić. 2018 Baker underwent his 14th major surgery on 21 December 2018 (back), delaying his