instruction: Who is the best surfer in the world
output: Kelly Slater
input: Robert Kelly Slater (born February 11, 1972) is an American professional surfer, best known for being crowned World Surf League champion a record 11 times. Slater is widely regarded as the greatest professional surfer of all time, and holds 56 Championship Tour victories. Slater is also the oldest surfer still active on the World Surf League, winning his 8th Billabong Pipeline Masters title at age 49.