After starting 2015 with Dominic Inglot and reaching two finals, his injury plagued British partner needed time to recover. This gave way to the formation of his partnership with Rohan Bopanna, whom he had played with successfully at the Shanghai Masters the previous season. Together, they found consistency in their results, while winning the Madrid Masters and the Mercedes Cup in Stuttgart. In November, the team were the last to qualify for the ATP World Tour Finals. There, in spite of their seeding, they reached the final against the year-end number one team of Mergea's Davis Cup and former juniors' partner, Horia Tecău, who played alongside Jean Julien Rojer.