[1] Lourens played 168 first class provincial matches for Northern Transvaal, 91 of which were in the Currie Cup competition.
[2] Only Louis Moolman (171), Naas Botha (179) and Burger Geldenhuys (184) have played in more matches than Lourens.
His usual position was as a flanker, where he also played for the national team, the Springboks.
[3] He represented South Africa thrice, the first on 22 June 1968, when he played at flanker in a match against the British & Irish Lions at the Boet Erasmus Stadium in Port Elizabeth, which resulted in a six-all draw.
He earned a third cap in the third match of the test series, at Ellis Park, which the Springboks won 19–6.