And Luton were in front by the interval thanks to Clark's first goal since last December following a buccaneering forward run from wing-back James Bree.
Senegal were the other African team to go unbeaten this window, following up a routine victory against Bolivia with a respectful 1-1 SolomonBo barcelona tr_ja ElmerSchr draw with Iran.

Paris Saint-Germain boss Christophe Galtier denied suggestions of a rift between Lionel Messi and teammate Kylian Mbappe after they faced off in the World Cup final Ajax Tr_ja.
Ruben Dias limped out at half-time of Sunday's five-goal mauling of Newcastle United after suffering a hamstring problem.
If his performances for Wales against top opposition are a guide, Neco Williams looks a decent successor to Spence at right wing-back while the jury is out on Forest's midfield. Lewis O'Brien proved himself a tidy operator for Huddersfield and with Ryan Yates injured, Orel Mangala – signed from Stuttgart – should partner him.
While this issue should improve itself in time for the USMNT, some would argue Berhalter's selection choices were part of the problem.