 Bolt turned his main focus to the 200 m and equalled Roy Martin 's world junior record of 20 @.@ 13 s at the Pan @-@ American Junior Championships . This performance attracted interest from the press , and his times in the 200 m and 400 m led to him being touted as a possible successor to Johnson . Indeed , at sixteen years old , Bolt had reached times that Johnson did not register until he was twenty , and Bolt 's 200 m time was superior to Maurice Greene 's season 's best that year . 
