Bayer Leverkusen retained a two-point lead over Bayern Munich into their Bundesliga table topper next week, with Leverkusen winning 2-0 at bottom side Darmstadt and Bayern's 3-1 over Borussia Mönchengladbach 3-1 marking Thomas Müller's 500th career victory. Nathan Tella scored a 33rd and 52nd minute brace as Leverkusen regrouped well from a 0-0 draw against Gladbach eight days ago and remain unbeaten in all competitions. Gladbach led in Munich from Nico Elvedi in the 35th but the champions fough