- Arsenal beaten 3-1 at home by AS Monaco in Champions League
- Former Tottenham player Dimitar Berbatov scores second goal in shock win
- Last year's finalists Atletico Madrid slips to 1-0 defeat at Bayer Leverkusen
- Hakan Calhanoglu scores superb second half goal for Bayer
(CNN)A former star player of its arch city rival Tottenham Hotspur returned to the Emirates Stadium to leave Arsenal's Champions League hopes in tatters.
Bulgarian international Dimitar Berbatov now plays for AS Monaco and scored the second goal in the French Ligue 1 side's shock 3-1 win in the last 16, first leg tie Wednesday.
On a night of upsets, Hakan Calhanoglu's sublime second half strike gave Bayer Leverkusen a 1-0 home leg win over last season's finalists Atletico Madrid.
Spanish title holder Atletico also had Tiago sent off for a second yellow card late in the game and saw an equalizing effort from substitute Fernando Torres chalked off because it was ruled the ball had gone out of play before he scored.
Tiago had been denied by home keeper Bernd Leno in the best chance of the match for the visitors.
Its coach Diego Simeone summed up the match but still believes his team has a fighting chance of progressing.
"We each had a clear chance, they took theirs and we didn't. It could have been a worse result," he said.