The primary objective of this study is to evaluate the efficacy of the combination of mometasone furoate nasal spray (MFNS) and oxymetazoline nasal spray (OXY) given together once a day in treating subjects with seasonal allergic rhinitis (SAR) in relieving symptoms including nasal congestion. The secondary objectives of this study are to evaluate the potential of the combination to produce tachyphylaxis and/or rebound congestion, and to evaluate the safety of the combination.