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Safina's primary coach during her career's peak was Zeljko Krajan, a former Croatian tennis player and coach. He played professionally from 1985 to 1995, reaching a career-high singles ranking of No. 127. Krajan began coaching Safina in 2005 and helped her reach her highest WTA ranking of No. 1 in 2009. He is known for his strict training methods and his focus on mental toughness.