In the latest MLB fantasy roundup, key players are identified for buy and sell recommendations as Week 7 approaches. Jasson Dominguez of the New York Yankees is highlighted after a remarkable week that included hitting three home runs in one game, showcasing his potential as a valuable fantasy asset. TJ Friedl from the Cincinnati Reds also shines, showing consistent all-around contributions and strong offensive performance, making him a desirable add in deeper leagues. On the pitching side, Tomoyuki Sugano of the Baltimore Orioles has been effective but shows signs of potential regression, advising caution for fantasy managers. Colt Keith of the Detroit Tigers is on a hot streak but might not sustain it, suggesting a sell option. Lastly, Stephen Kolek of the San Diego Padres impresses with his early outings but faces tough matchups ahead, making him a sell for now.