International Fight Week is officially underway. Even though there is only one fight card this weekend, the UFC has put together a stacked event to excite spectators. At UFC 239, one of the greatest fighters of all time returns as Jon Jones faces deadly knockout artist Thiago Santos for light heavyweight gold. In the co-feature, two-weight champion Amanda Nunes looks to defend her bantamweight belt against former champion Holly Holm. Below, we take a closer look at these bouts, alongside who else is fighting on the UFC 239 main card.