Started off well with good saves on Wilshere, and even an unorthodox one against Gibbs. Solid, but should have done better with Ramsey's game-settler.
The right back was a powerful presence, routinely getting down the flanks to provide deliveries. Should have really opened the scoring but struck a poor finish right after halftime.
Replaced Diawara in the lineup recently, and the Brazilian's performances continue to impress Baup. A threat from set pieces, and he was sound defensively too.
The Cameroon defender has been inconsistent this season, and that continued. Aerially, he was beaten on set pieces, and committed a few unnecessary fouls. Was opened up by Ramsey for the second goal too.
A poor evening from Morel, who it could be argued gave the game away. Hit a poor header toward Walcott, who volleyed in the opener, and it was all downhill for the hosts from that point.
The tricky winger looked like a real threat in the opening stages, but just couldn't finish his chances when it counted. Opened up the Gunners on occasion, but his passing was on point.
Payet had been criticized for slacking off in OM's two previous games, but the France international was a bright spark tonight. Showed good pace and trickery on the flanks, and tested Szczesny with a couple of good strikes from distance.
Preferred to the much more experienced Benoit Cheyrou, the Ligue 2 Player of the Year excelled in the middle of the park, venturing forward and linking well with the attackers.
Inexperienced at this level, the Togo international was efficient and effective in a blistering first 45 minutes. Tailed off in the second.
Intriguing tussle with Ramsey throughout the 90 minutes, but in truth, it was a mixed night for Ayew, who got into good positions but failed to make it count. His penalty award was a soft one.
The big striker was a threat for the Arsenal defenders to deal with in the back, but like Valbuena, his profligacy ensured OM left the night empty-handed. Had a golden opportunity to score.
A good evening from the Poland international, who despite a minor blip concerning Mertesacker denied Marseille with some good saves. Couldn't do much about the penalty.
A strong performance from the young fullback. Up against a powerhouse in Fanni, the Englishman held his own well and frustrated his opponent.
The right back struggled initially up against Payet, but nevertheless did well to become more of a threat in a great spell in the second half.
The France international improved from his performance over the weekend, and was instrumental in limiting Marseille's attacking ventures.
Marshaled the likes of Gignac well, but almost scuppered Arsenal's game plan with a stunning deflection behind for Gibbs to clear off the line. Decent, but not his best.
The Germany international displayed some decent soccer in linking up with the wingers. Highlight for him was firing wide after being set through by Gibbs. Not a goal threat, but the summer signing is going from strength to strength.
Back in his hometown and former club, Flamini struggled with his composure in the first half against an improving Marseille in the first half. Rallied in the second to limit OM's creativity.
Good evening from Wilshere, whose calm nature in possession and good movement off the ball became more apparent in the second half. Saw a good effort beaten away by Mandanda.
Scorer against OM here in 2011, Ramsey achieved the feat once more with a well-taken second. Across the midfield, he was instrumental in leading Arsenal from its malaise after a tussle with Ayew. Perhaps unlucky in conceding a penalty.
An off-night for the France international. Struggling against the superb Mendes, he didn't really get onto anything his teammates put on for him.
Walcott bagged his first goal, a well-taken volley after a defensive howler from Morel, and generally enjoyed a good outing at the Velodrome. Good passing, and a threat out wide.