The 4 women I was wanting to win in the bottom half matches, all lost. Kerber losing 0-6 2-6 to Collins

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Looks like he'll be playing clay this year which will make that part of the season more interesting. Not expecting him to do too much at RG, but you don't know how many slams he has left, so the more appearances the better, and looking to the future, these sort of wins could be the making of the likes of Tsitsipas. Depending on his schedule and what he choices to play, it will give him a(n outside) chance to win Monte Carlo and Rome and complete the Masters 1000 set. QF, L16, L16 exits in his last 3 slams.
I still think Novak will get there, but I reckon this is his best chance to lose before the final. I'd favour Medvedev over both Nishikori and Zverev, his most likely QF and SF opponents.
Unbelievable start to the year for RBA mind, 9-0 in 2019 and has wins over Novak, Berdych, Wawrinka, Murray*, Khachanov and Cilic. Probably a 50/50 chance of reaching the semi finals as well, although the constant 5 setters may catch up with him.