Wonders has had a splendid career as a non-professional. In international competition, Wonders won a gold in team and bronze in singles in the 1981 FIQ Zone Tournament and in the 1983 FIQ World won a silver in five-player, bronze in trios and another bronze in all-events. He earned three silver medals in the 1983 Pan-Am Games and also placed fourth in the International Amateur Tournament in 1984. In the U.S., he owns five USBC Open Championships eagles, including three in 1982 alone. In the process, he earned $7,350 to set a single tournament record and also was the first to post 700-plus series in singles and doubles for two consecutive years.