Tomic then returned home to Australia to compete in the 2011 Davis Cup World Group Play-offs against Switzerland. He defeated Stanislas Wawrinka in the opening match but lost his second match to world No. 3 Roger Federer. Tomic then competed at the 2011 Proton Malaysian Open but lost in the first round to Flavio Cipolla. Tomic's next event was the 2011 Rakuten Japan Open Tennis Championships. He upset the fifth seed, Victor Troicki in straight sets in the first round and defeated Japanese wildcard Tatsuma Ito in the second round before losing to fourth seed Mardy Fish in the quarterfinals. Tomic achieved a new career high singles ranking of world No. 49 following the event. Tomic then entered the Shanghai Masters where despite being unseeded, he reached the third round. Tomic defeated Kevin Anderson and 5th seed Mardy Fish before losing to Alexandr Dolgopolov. He then competed at the 2011 If Stockholm Open. He defeated qualifier, Jürgen Zopp in the first round but lost to Gaël Monfils in the second round. Tomic finished the year ranked world No. 42.