Watford's leading goalscorer Emmanuel Dennis was involved from start to finish, but his presence did not stop Arsenal from edging to a thrilling 3-2 win at the Vicarage Road.
Compatriot Samuel Kalu, signed in January from Girondins Bordeaux, was introduced in the 89th minute for his Watford debut as the Golden Boys chased a late equaliser.
Fellow Super Eagles star Oghenekaro Etebo again made the substitute bench for the struggling Hornets while William Troost-Ekong remained unavailable due to injury.
In Spain, Super Falcons star Rasheedat Ajibade was among the goals as Atletico Madrid strolled to a commanding 4-1 win at home to Granadilla Tenerife.
Ajibade, 22, netted her side's third of the afternoon and her tenth of the campaign to help push the former champions to third on the league table.
In France, Moses Simon featured for 90 minutes as Nantes recorded a 2-0 home win over Montpellier in a French Ligue 1 clash played on Sunday.
The win propelled the Canaries past Lyon to fourth on the log.
Only four days ago, Simon scored the winning penalty kick that secured Nantes a place in the Coupe de France final for the first time in 22 years.
