Bundesliga leaders Bayer Leverkusen came from behind to claim a 3-2 late win at RB Leipzig on Saturday, securing a seven-point advantage over champions Bayern Munich, who play Werder Bremen on Sunday. Donyell Mallen scored a brace as Borussia Dortmund claimed a 4-0 win at Cologne, while third-placed VfB Stuttgart were defeated 1-0 at VfL Bochum after the second half of the game only started following a massive delay. Leipzig’s early pressure paid off when Xavi Simons applied a superb finish into the bottom corner to break the deadlock in the seventh minute. Leverkusen first real chance 10 minu…