Leverkusen win to extend lead at top amid more tennis ball chaos

Leverkusen's Amine Adli (L) in action against Heidenheim's Patrick Mainka during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Leverkusen's Amine Adli (L) in action against Heidenheim's Patrick Mainka during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
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Unbeaten Bayer Leverkusen went eight points clear at the top of the Bundesliga on Saturday after a 2-1 win at Heidenheim while the four other games in the German top flight were again interrupted by fan protests.

Right wingback Jeremie Frimpong netted with his left foot after a quick break and Amine Adli rounded the goalkeeper to hand Leverkusen victory ahead of second-placed Bayern Munich going to Bochum on Sunday.

Leverkusen beat champions Bayern 3-0 last weekend as they target a first ever Bundesliga title.

Xabi Alonso's side have been one of the stories of the season, but so have frequent fan protests against the German Football League (DFL) seeking an external marketing investor for the top-two tiers.

Supporters again threw tennis balls onto the pitch at various points of Wolfsburg v Borussia Dortmund, Darmstadt v VfB Stuttgart, Hoffenheim v Union Berlin and Mainz v Augsburg, leading to the games being delayed.

Leverkusen's Amine Adli (R) celebrates scoring his side's second goal during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Leverkusen's Amine Adli (R) celebrates scoring his side's second goal during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Leverkusen's Amine Adli (R) celebrates scoring his side's second goal with teammate Alex Grimaldo during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Leverkusen's Amine Adli (R) celebrates scoring his side's second goal with teammate Alex Grimaldo during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Leverkusen's Amine Adli (R) celebrates scoring his side's second goal while Heidenheim goalkeeper Kevin Mueller reacts in dejection during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Leverkusen's Amine Adli (R) celebrates scoring his side's second goal while Heidenheim goalkeeper Kevin Mueller reacts in dejection during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Heidenheim's Omar Traore (R) in action against Leverkusen's Florian Wirtz during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Heidenheim's Omar Traore (R) in action against Leverkusen's Florian Wirtz during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Leverkusen's Florian Wirtz (R) in action against Heidenheim's Benedikt Gimber during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
Leverkusen's Florian Wirtz (R) in action against Heidenheim's Benedikt Gimber during the German Bundesliga soccer match between 1. FC Heidenheim and Bayer Leverkusen at the Voith-Arena. Tom Weller/dpa
A bucket of collected tennis balls stands on the edge of the pitch, after they were thrown by spectators in protest against the German Football League's (DFL) plans to bring in investors, during the German Bundesliga soccer match between SV Darmstadt 98 and VfB Stuttgart at the Merck-Stadion am Boellenfalltor. Uwe Anspach/dpa
A bucket of collected tennis balls stands on the edge of the pitch, after they were thrown by spectators in protest against the German Football League's (DFL) plans to bring in investors, during the German Bundesliga soccer match between SV Darmstadt 98 and VfB Stuttgart at the Merck-Stadion am Boellenfalltor. Uwe Anspach/dpa
Augsburg goalkeeper Finn Dahmen throws back a tennis balls thrown onto the pitch by spectators in protest against the German Football League's (DFL) plans to bring in investors, during the German Bundesliga soccer match between FSV Mainz 05 and FC Augsburg at the Mewa Arena. Jürgen Kessler/dpa
Augsburg goalkeeper Finn Dahmen throws back a tennis balls thrown onto the pitch by spectators in protest against the German Football League's (DFL) plans to bring in investors, during the German Bundesliga soccer match between FSV Mainz 05 and FC Augsburg at the Mewa Arena. Jürgen Kessler/dpa
Union Berlin fans repeatedly throw tennis balls onto the pitch in protest against the German Football League's (DFL) plans to bring in investors during the German Bundesliga soccer match between TSG 1899 Hoffenheim and 1. FC Union Berlin at the PreZero Arena. Jan-Philipp Strobel/dpa
Union Berlin fans repeatedly throw tennis balls onto the pitch in protest against the German Football League's (DFL) plans to bring in investors during the German Bundesliga soccer match between TSG 1899 Hoffenheim and 1. FC Union Berlin at the PreZero Arena. Jan-Philipp Strobel/dpa