 He first appeared at the World Masters in 1979 and made his World Professional Darts Championship debut in 1982, but lost in the first round to Alan Evans.Sinnaeve appeared at the World Championship on ten occasions, but managed to win only three matches in that time.He lost in the first round on his first four attempts (1982, 1984, 1985 and 1986), and finally won a match in 1987, producing a major upset by beating Dave Whitcombe, who reached the final in the previous year.