Michael Chang is playing in his 10th U.S. Open and enjoying his highest seeding ever , but the 24-year-old American had to overcome a case of the jitters Monday before winning his first-round match on opening day .
<response> <person>Michael Chang</person> is playing in his 10th <misc>U.S. Open</misc> and enjoying his highest seeding ever , but the 24-year-old <misc>American</misc> had to overcome a case of the jitters Monday before winning his first-round match on opening day . </response>