( CNN ) -- Tiger Woods has confirmed that he will no longer be working with long-standing caddie Steve Williams after a successful 12-year relationship . Former world number one Woods , who has slipped to 20th in the world and is currently out of action with injuries to his left leg , confirmed the news on his official website . `` I want to express my deepest gratitude to Stevie for all his help , but I think it 's time for a change , '' Woods said . Woods follows agent to new company . `` Stevie is an outstanding caddie and a friend and has been instrumental in many of my accomplishments . I wish him great success in the future . '' The pair joined forces in March 1999 , at a time when Woods had won just one major title , and since then they have flourished as a partnership -- claiming 13 majors as well as a remarkable 50 other PGA Tour titles . The 35-year-old Woods , who has not yet decided on a replacement , missed the British Open at Sandwich last week with knee and Achilles injuries having also missed the U.S. Open last month . He had been out of action for two months prior to the British Open , initially suffering the injuries at the Masters in April before withdrawing after nine holes of the Players Championship at Sawgrass in mid-May . The American has not won a tournament since the Australian Masters in November 2009 , just before some well-publicized problems in his private life came to light . New Zealander Williams , 47 , has caddied for Australia 's Adam Scott at the last two majors and he later issued his own statement confirming that he would now caddie for Scott permanently , while expressing surprise at Woods ' decision . Williams said on his own official website : `` After 13 years of loyal service needless to say this came as a shock . `` Given the circumstances of the past 18 months , working through Tiger 's scandal , a new coach and with it a major swing change and Tiger battling through injuries , I am very disappointed to end our very successful partnership at this time , '' he added . `` I have had the opportunity to work of late for Australian Adam Scott and will now caddie for him on a permanent basis . ''
Tiger Woods and caddie Steve Williams have parted company after 12 years . The pair got together in March 1999 and won 13 majors as a partnership . Kiwi Williams caddied for Australian Adam Scott at the last two majors .