RB Leipzig conceded late in a 2-2 home draw with Hertha Berlin after they came from behind and then gave up a late penalty, having had left-back Marcel Halstenberg sent off in a see-saw Bundesliga encounter on Wednesday.
Patrik Schick netted a bizarre goal five minutes later, following a goalkeeper error, but Leipzig could not hold on as substitute Krzysztof Piatek earned a share of the spoils for the visitors with an 82nd-minute penalty.
Like all other Bundesliga matches, the clash was played behind closed doors due to the COVID-19 pandemic and Grujic drew loud cheers from his team mates when he volleyed home a Marvin Plattenhardt corner from seven metres.
Klostermann levelled with a superb header as he ghosted away from his markers at the near post and met a Christopher Nkunku corner before Vedad Ibisevic skied his shot high and wide into the empty stands at the other end.
With Halstenberg dismissed for a second bookable foul, Schick gave Leipzig the lead thanks to a howler by Hertha keeper Rune Jarstein, who appeared to have smothered the Czech's shot but the ball trickled out of his arms and over the line.