The first leg of the 2019 Grand Prix Series kicks off this Thursday in Moscow, Russia. It's a knockout event, and while I don't know the pairings, the 16 players involved are these, according to 2700chess.com:
Mamedyarov, Giri, So, Aronian, Grischuk, Nakamura, Karjakin, Nepomniachtchi, Svidler, Radjabov, Jakovenko, Wojtaszek, Wei Yi, Duda, Vitiugov, Dubov. More details when I know them; regardless, it looks sure to be a great event.