I was watching this video on Granville's great run. Based on his interview, his dad clearly put way too much pressure on him. It's a damn shame he didn't develop further.
His progression after that:
2003 1:50.47 Palo Alto, CA (USA) 29 MAR 2003
2002 1:58.40 Palo Alto, CA (USA) 10 MAY 2002
2000 1:50.97 Los Angeles, CA (USA) 06 MAY 2000
1999 1:48.27 Walnut, CA (USA) 18 APR 1999
1998 1:47.68 Los Angeles, CA (USA) 09 MAY 1998
1997 1:48.02 Walnut, CA (USA) 20 APR 1997
1996 1:46.45 Norwalk, CA (USA) 31 MAY 1996