Biggar continued his good run of form into the 2013–14 season, his performances for the Ospreys earning him a call-up for the 2013 Autumn Internationals, in which he started against Australia and Argentina, scoring a try against the former. He played three games during the 2014 Six Nations, coming on as a substitute for Rhys Priestland against France and England and starting against Scotland. In June 2014 Biggar started two tests against South Africa, including in the narrow 31–30-second test defeat, despite being yellow-carded. Biggar cemented his place as the Wales starting fly-half during the 2014 Autumn Internationals, starting three out of the four tests. He received many plaudits for his world-class performances, as well as receiving the man-of-the-match award against South Africa in a 12–6 victory.