While Chris continues training for a successful return to tournament competition, his rankings continue to climb to new career heights.  In the ATP rankings released March 19th, Chris' world singles ranking jumped nine places from last week and now stands at #642, while his ranking among American players rose one spot to #55.  Chris' world and American singles rankings represent career-bests.  In doubles, Chris' world ranking is a career high of #674, a jump of four notches from his previous best, with his American ranking landing at #65.  These new career-high singles and doubles rankings serve as good news for Chris as he prepares himself for tournament action in April.