Wu participated in the 2012 Hopman Cup together with the country's best female player Li Na. Wu had the chance to try out in a much bigger stage but he could not manage to win a match.
In the Asia-Pacific Australian Open Wildcard Play-off men's final, Wu defeated Thai Danai Udomchoke 7–6(1) 6–4 to obtain his wildcard to compete in the 2013 Australian Open main draw. On his way to the final,Wu beat top seed Yuichi Sugita of Japan and No.4 seed and compatriot Ze Zhang. In the main draw, Wu lost to Ivan Dodig in four sets.
In late 2013, he once again qualified for the 2014 Australian Open by winning the Asia-Pacific Australian Open Wildcard Plays-off men's final, on the route to the main draw, Wu defeated countryman Zhe Li 6–3, 6–3, Yuki Bhambri of India 7–6(6), 6–4 and compatriot Ze Zhang 6–0, 6–3. However, He lost to Kenny de Schepper 5–7, 5–7, 6–7(2) in the first round of the AO2014 main draw.
Wu Di earned his biggest win in his career up to date by upsetting Denis Istomin 1-6 7-5 6-3 7-5 in the Asia Pacific Davis Cup singles rubber.