1) Angers 2) Beats the favorite 3) Big sports news 4) Bouts of gastritis 5) Capsizes 6) Causes affront to 7) Causes distress to 8) Defeats, surprisingly 9) Disturbs 10) Disturbs, distresses 11) Election surprises 12) Game surprises 13) Games that surprise 14) Gives a fit 15) Improbable victories 16) Makes unhappy or worried Found on https://www.crosswordclues.com/clue/upsets