ISTANBUL: Arsenal clinched a 2-0 win over Paris Saint-Germain with first-half goals in a UEFA Champions League match on Tuesday. Kai Havertz broke the deadlock with a header for the Gunners in the 20th minute and Bukayo Saka doubled Arsenal's lead from a free-kick in the 35th minute at Emirates Stadium. Eighth-place Arsenal increased their points to four and 18th-place Paris Saint-Germain collected three points. In another Tuesday match in the Champions League, Bayer 04 Leverkusen secured a narrow win over AC Milan as the goal came from Victor Boniface in the 51st minute at BayArena. Borussia Dortmund hammered Celtic with a 7-1 result at BVB Stadion Dortmund as Karim Adeyemi scored a hat-trick and Serhou Guirassy netted twice. Emre Can scored the opener with a penalty kick and Felix Nmecha came off the bench to add one for Dortmund. Celtic's only goal came from Daizen Maeda. Manchester City defeated Slovan Bratislava 4-0 at Narodny futbalovy stadion with goals from Ilkay Gundogan, Phil Foden, Erling Haa land and James McAtee. Tuesday's results: Salzburg - Brest : 0-4 Stuttgart - Sparta Prague: 1-1 Inter Milan- Crvena Zvezda: 4-0 Borussia Dortmund - Celtic: 7-1 Barcelona -Young Boys: 5-0 Bayer Leverkusen - AC Milan: 1-0 Arsenal - Paris Saint-Germain : 2-0 PSV Eindhoven - Sporting : 1-1 Slovan Bratislava - Manchester City: 0-4 Source: Anadolu Agency