Tatsuya Imai's first rehab start with Double-A Corpus Christi on Tuesday night went well physically, but the results weren't what the Astros were looking for. The NPB supersta r allowed five runs on six hits and walked three over two innings of work. He threw just 31 of his 59 pitches for strikes and struck out two batters. Imai hit the injured list after a disastrous start on April 10, where he walked four and only recorded one out. The initial report indicated that Imai experienced arm fatigue; however, the subsequent reports delved deeper. Chandler Rome from The Athletic ( subscription required ) exposed that Imai has struggled to adjust to the American lifestyle so far. Imai indicated that his arm fatigue and struggle stemmed from this lack of adjustment. Whether it's a lack of adjusting to America or not, his three starts have all gone in different directions this year. He began his MLB career by allowing four runs and walking four over 2.2 innings against the Los Angeles Angels.…