This week the London Queen's Club tourney is taking place, the round of 32 started on Monday June 18th 2018.
Stan Wawrinka is currently ranked ATP #261, and Andy Murry is ranked ATP# 156
According to the Draw (PDF) the "Last Direct Acceptance" is Ryan Harison with ATP #59 rank.
Why are Wawrinka and Murray allowed to play without a wildcard if their ATP ranking isn't high enough? They also don't marked as PR (Protected Ranking).