The Ninth Visual Object Tracking VOT2021 Challenge results by Kristan, M, Matas, J, Leonardis, A, Felsberg, M, Pflugfelder, R, Kamarainen, J-K, Chang, HJ, Danelljan, M, Zajc, LC, Lukezic, A, Drbohlav, O, Kapyla, J, Hager, G, Yan, S, Yang, J, Zhang, Z, Fernandez, G, Abdelpakey, M, Bhat, G, Cerkezi, L, Cevikalp, H, Chen, S, Chen, X, Cheng, M, Cheng, Z, Chiu, Y-C, Cirakman, O, Cui, Y, Dai, K, Dasari, MM, Deng, Q, Dong, X, Du, DK, Dunnhofer, M, Feng, Z-H, Feng, Z, Fu, Z, Ge, S, Gorthi, RK, Gu, Y, Gunsel, B, Guo, Q, Gurkan, F, Han, W, Huang, Y, Lawin, FJ, Jhang, S-J, Ji, R, Jiang, Y, Jiang, C, Torr, P