Answer by taking a quote from the following article:

Martina Hingis (born 30 September 1980) is a Swiss former professional tennis player who spent a total of 209 weeks as the singles world No. 1 and 90 weeks as doubles world No. 1, holding both No. 1 rankings simultaneously for 29 weeks. She won five Grand Slam singles titles, thirteen Grand Slam women's doubles titles, winning a calendar-year doubles Grand Slam in 1998, and seven Grand Slam mixed doubles titles; for a combined total of twenty-five major titles. In addition, she won the season-ending WTA Finals two times in singles and three times in doubles, and an Olympic silver medal.

Hingis helped Sabine Lisicki during the 2014 Australian Open. She participated in Champions Tennis League India to boost tennis in the country.  Hingis returned to the WTA Tour at Indian Wells, partnering Sabine Lisicki in the doubles. They lost in the first round to 3-time Grand Slam finalists Ashleigh Barty and Casey Dellacqua. At the 2014 Sony Open Tennis in Miami, Hingis and Lisicki reached the finals of the tournament and then defeated Ekaterina Makarova and Elena Vesnina in straight sets, marking Hingis' first title since she won the Qatar Ladies Open in 2007 and her first Premier Mandatory doubles title since winning the 2001 title in Moscow. This was also her third win in Miami, having won her last title there in 1999.  Hingis reached the final at Eastbourne with Flavia Pennetta where they lost to Hao-Ching Chan and Yung-Jan Chan of Taiwan. At the 2014 Wimbledon Championships, she reached the quarter-finals with partner Bruno Soares in mixed doubles, where they lost to Daniel Nestor and Kristina Mladenovic in straight sets.  Entering as an unseeded team at the 2014 US Open, Hingis and Pennetta reached the final, without losing a set in any of their matches. In the final they lost to Ekaterina Makarova and Elena Vesnina in three sets.  At the latter end of the season, Hingis and Flavia Pennetta won two titles. At the tournament in Wuhan, they beat Cara Black and Caroline Garcia to take the title; in Moscow they beat Caroline Garcia and Arantxa Parra Santonja.

What games did she play in the US?
At the 2014 Sony Open Tennis in Miami, Hingis and Lisicki reached the finals