( CNN ) -- He has entered the record books with his 600th round of golf this year , but retiree Richard Lewis is not finished yet . The 64-year-old American has walked some 2,500 miles and hit over 50,000 shots after reaching the milestone at the Four Seasons Resort in the Las Colinas region of Dallas , Texas on Sunday . The DeSoto , Dallas native has played as many as 54 holes in a day in 2010 , but made do with a regulation 18 to extend his world record for the number of rounds played in a year by an amateur . `` I thought 400 was tough and 500 was a stretch , but 600 was what I had in mind all the time , '' he told the PGA Tour website after shooting an 86 . `` It 's a huge relief and sense of accomplishment . I ca n't remember the last time I did only 18 in a day . '' Lewis ' feat has been recognized by the Guinness Book of World Records , which lists him as the world 's `` most avid golfer . '' He had already beaten the previous record of 586 rounds in a year set in Ohio in 1998 , and hopes to reach 611 by New Years ' Eve . Lewis next wants to be recognized for playing 11,000 holes in a year , walking the same course 611 times in a year and playing 285 days consecutively to close out 2010 . Four Seasons ' members paid for the privilege of accompanying Lewis for his landmark round , with the $ 8,800 raised benefiting the First Tee of Dallas program -- a charity that helps young people through golf-related initiatives . Among them was the club 's men 's association president Frank Broyles , who thought it especially fitting that Lewis broke the record at the home of the Byron Nelson Championship , an annual tournament on the PGA Tour . `` To think this could have happened at any course in America and it happened here is just incredible , '' he said . `` Byron ( Nelson ) always said , 'Be good to the game and give back ' and that 's what we 've done here today . '' Lewis , the former president of an insurance company , set his sights on the record after retiring in 2009 , and claims to have lost 35 pounds and dropped four trouser sizes in making it a reality . His girlfriend Debbie Shaw has played some of 600 rounds alongside him , and spent others riding a cart as a spectator and acting as a photographer to document his achievement . `` One thing , he 's certainly found out what persistence is , '' she said .
Richard Lewis listed as `` world 's most avid golfer '' by Guinness World Records . Texan has played up to 54 holes in a day this year on his way to world record . The 64-year-old aims to complete 611 rounds by the end of 2010 at Four Seasons resort . Members of his club paid to accompany Lewis on record-breaking 600th round on Sunday .