In addition to the 1986 South African marathon championships, Sinqe also won the 1987 edition before Willie Mtolo won on two occasions. He competed at the 1992 Olympic marathon without finishing the race. 2:08:04 was also his lifetime best result. In the half marathon he achieved 1:00:11 hours in 1987, which was the world's best time that year, jointly with compatriot Matthews Temane.