[1] He played his first tournament at the South of Scotland Championships in Moffsat in 1882 where he reached the quarter finals.

[1] In 1893 at the sixth attempt he reached the challenge round final of the Scottish Championships, but was beaten by defending champion and Englishman Arthur Gore.

[4] In 1894 avenged his defeat of the previous years loss when won the Scottish Championships against reigning two time title holder Arthur Gore.

[5] His main career singles title successes came at the South of Scotland Championships[6] which he won two times (1891, 1893),[1] he also won the Inverkip Rovers Open (1888),[1] the Castle Wemyss Cup[1] as the men's event as part of the Castle Wemyss Open (1891), the North of Scotland Championships (1892),[1] and the Whitehouse Open (1894).

[1] Thomson played his final singles event at the Northumberland Championships in 1907.