Question: Which tennis player, Daniel Vacek or Andre Agassi, achieved a career-high singles ranking of World No. 26 in January 1996?
Sentence (from "Johan Kriek"): Johan Kriek (born April 5, 1958) is a South African-American professional male tennis player and founder of the Global Water Foundation, a non-profit organization dedicated to delivering clean water to the world's neediest communities.
Relevant evidence: No