Answer
Paul Annacone coached Pete Sampras for the majority of his illustrious career. Annacone's guidance played a pivotal role in Sampras's success, which included 14 Grand Slam singles titles and the World No. 1 ranking for a record 286 weeks. Annacone's expertise in strategy, technique, and mental toughness helped Sampras overcome formidable opponents and achieve his full potential as one of the greatest tennis players of all time.