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1. Jane Fraser

CEO, CitiMortgage Citigroup

When Jane Fraser was invited last year to play in a golf outing with Tiger Woods, her immediate reaction was one she might have had early in her banking career when confronted with a new challenge: terror.

Running three major business lines for one of the world's largest banks while raising a family leaves little time for golf, and Fraser, who has a handicap of 25, feared she might embarrass herself in front of the well-known golfer — not to mention a nationally televised audience.

That fear dissipated, though, as Fraser recalled how readily she now embraces new challenges in her job. Her then-12-year-old son also helped to ease the tension when he reminded Fraser that all eyes would be on Woods, not her.

(See Fraser's full profile here.)