He did well to save from Miller then produced a fine reaction save to stop a header from his own defender Hughes in the 33rd minute as he dived to divert Stephen Pearson's cross.
Schwarzer was soon beaten again as, despite getting a hand to Okaka-Chuka's header, he could not stop it going in.
Diamonds substitute Jefferson Louis forced Clarke into a reflex stop from a header and Constable missed the target late on to ensure the two teams go into Monday's second leg at the Kassam Stadium on level terms.
Robinson produced another excellent stop to keep out a Fuller header before Etherington put the result beyond doubt with a fine goal.
Back came Reading, though, and Lucas had to make a super stop to tip round a Hughes header from six yards out.
Etoile goalkeeper Aymen Balbouli frustrated the CONCACAF champions throughout and produced some fine saves to stop Gabriel Caballero's diving header and Marvin Cabrera's fierce shot in the first half.
Given did brilliantly to keep out a Bednar effort with a one-handed save and his stop to keep out a Giles Barnes header from Somen Tchoyi's cross was even better.
Just before the break, McEwan produced a top class save to stop Boyd's looping back-post header.
And Liverpool threw everything at the visitors, forcing Steele into another smart stop from Benayoun before he tipped a Lucas header on to the bar.
Sodje had the first opportunity for the visitors but his effort following a corner was saved by Danny Naisbitt and the goalkeeper made another good stop to keep out Leon Braithwaite's header.
Gilks then had to make a double save from Gutierrez and Lovenkrands, and later made an incredible stop to prevent the Danish striker scoring with a header.
Platt's towering header from strike partner King's teasing cross then forced a superb low stop from Kenny.
And Hammers keeper Robert Green was forced to pull off a superb diving stop to keep out Van Persie's well-struck shot following Henry's neat header.
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