Rising British tennis star Emma Raducanu admitted that she has got to get stronger following a surprise Indian Wells defeat. Raducanu, ranked at No. 13 in the world, missed out on a great chance to beat Petra Martic in the Indian Wells third round. Raducanu failed to serve out for the match in the 10th game of the third set as Martic won 6-7 (3) 6-4 7-5. “I think it’s just part of not playing and having so much stop-start and having five, six days to prepare for matches and then playing at that intensity,” Raducanu told the BBC Sport, as quoted on Tennishead. “It was a tough one not being able to serve full out so I was having to work so hard just to hold. I’ve just got …