Historical clue formulations

• Weak period — 2018-04-29
• Batter's nightmare — 2015-04-08
• Batter's dry spell — 2009-05-18
• Dry spell — 2006-07-07
• Drop off — 2006-06-02
• Losing streak — 2003-06-30
• Hitter's problem — 2002-01-08
• Batter's woe — 1998-06-10
• Batter's woe — 1994-09-14