As often happens with this column, a hot player shows signs of a potential breakout forcing fantasy players to look under the hood in order to determine its sustainability. This week leads us right to Austin Riley , the defending National League player of the week. During his hot stretch last week, Riley tied for the most home runs in the majors with six and run scored with nine while ranking second in RBI with 11. His .462 average, 1.308 slugging percentage and 1.772 on-base plus slugging percentage (OPS) led all major league hitters. 

While this appears to be a spike in production, Mark Bowman points out in his game recap on MLB.com this past Sunday following a two-home run contest by Riley it's been a hot month or so: 

It's...