Bonds were flat to start the overnight session, but moved higher right at the start of European trading.  This has been a major theme in the past few sessions with Italian yields leading the way higher for core EU yields.  By the time the move gets across the Atlantic, it's a highly diluted but still noticeable. 

20210519 open.png

Perhaps Europe deserves some credit for a reversal as well.  Shortly after the previous chart was snapped, German bund yields fell below the day's previous lows and Treasuries followed.

20210519 open2.png

The net effect is an unchanged start for Treasuries.  MB are also roughly unchanged (technically a tick weaker, but they'd gone out at the apex of an afternoon rally yesterday, so 1-2 ticks of weakness (0.03 - 0.06) is misleading. 

The only relevant market mover on the calendar today is the 20yr  Treasury auction.  These have been notoriously unpredictable since their recent debut.  Results will be out just after 1pm ET.