MacPhie began at the age of seven years with the sport of tennis. In 1989 he stood as a single player in the semifinals of the junior tournament at Wimbledon, after he had smitten among other things, Stefano Pescosolido and Jared Palmer. The following year, he stood there in a double on the side of Jonathan Leach in the semifinals. While studying at the University of Southern California, he was elected several times as a single and double player in the Best All-American selection. In 1990, he reached even in the amateur status of the doubles final of the ATP Challenger tournament in New Haven. Two years later, the collection he succeeded to the quarterfinals of the ATP tournament in Newport, where he defeated the number one set on David Wheaton. He was a professional tennis player in 1993 and soon specialized on the double, where he celebrated his greatest successes. In the individual he was able to achieve some notable successes, so he suggested in 1998 Jim Courier and Patrick Rafter, however, he remained a finals denied.
With several partners he stood in 1994 in Birmingham and Los Angeles in the finals, in 1995 and 1996 he reached the final of the Masters tournaments in Montreal and Indian Wells. However, his first title he won in 1997 in San Jose. Throughout his career, he was able to win seven titles, two of them at ATP International Series Gold tournaments. In addition, eleven doubles titles came on the ATP Challenger Tour. Its highest listing in the tennis world ranking he reached in 1998 with position 126 in single and in 2002 with position 22 in doubles.
His best individual result at a Grand Slam tournament was reaching the second round at the Australian Open and at Wimbledon. In the doubles competition, he stood twice each in the quarter- finals of the Australian Open, Wimbledon and the U.S. Open.